Classroom Furniture for Small Spaces
117 resultsEncourage interaction between the young learners in your classroom with this Flash Furniture Bright Beginnings Hercules trapezoid wooden activity table. Kid-friendly rounded edges reduce the chance of accidental injury, while the neutral tone blends in with any decor and helps kids focus on the task at hand. This activity table serves as a play, dining, or craft space and comfortably accommodates up to three children. Composed of an ultra-strong GREENGUARD certified engineered wood tabletop and beechwood legs, this school table can support up to 300 lbs. of static weight. The surface is easy to clean and doesn't require a lot of maintenance. Assembly of the table takes less than 30 minutes..Commercial-grade trapezoid classroom activity table that can serve as a play, dining, or craft space.Composed of a birch plywood tabletop and beechwood legs in a glossy finish.Dimensions: 18"H x 47"W x 20.75"D.Seats up to three children.Kid-friendly design with rounded corners for safety.Meets or exceeds the GREENGUARD standard.Supports up to 300 lbs. of static weight.Easy to clean: just wipe clean with a damp cloth, then dry.15-year manufacturer limited warranty
Encourage interaction between the young learners in your classroom with this Flash Furniture Bright Beginnings Hercules square wooden adjustable-height activity table. Kid-friendly rounded edges help reduce the chance of accidental injuries, while the neutral tone blends in with any decor to help kids focus on the task at hand. This activity table serves as a play, dining, or craft space and comfortably accommodates up to three children. Composed of an ultra-strong GREENGUARD certified engineered wood tabletop and height-adjustable powder-coated metal legs that adjust in 1" increments up to 9", this school table can support up to 300 lbs. of static weight and accommodates kids from pre-K to grade 2. The table features adjustable floor glides that provide a level work surface and prevent damage to indoor hard flooring. The surface is easy to clean and doesn't require a lot of maintenance. Assembly of the table takes less than 35 minutes..Commercial-grade height-adjustable square classroom activity table that can serve as a play, dining, or craft space.Composed of a birch plywood tabletop and powder-coated metal legs in a beech finish.Dimensions: 15"-23"H x 24"W x 24"D.Seats up to three children.Kid-friendly design with rounded corners for safety.Assembles in 35 Minutes or Less.Meets or exceeds the GREENGUARD standard.Floor protector plastic glides prevent indoor flooring damage.Supports up to 300 lbs. of static weight.Easy to clean: just wipe clean with a damp cloth, then dry.15-year manufacturer limited warranty
Flash Furniture offers a broad assortment of top quality furniture at affordable prices. From chairs and sofas to bedroom and patio sets, Flash Furniture offers furniture that's the perfect balance of form and function for every room of your home or business. This Bright Beginnings three-section open storage with mirrored top is a perfect addition to any classroom..Commercial-grade modular wooden classroom open display shelf unit with mirror top is a perfect addition to any classroom.Dimensions: 16"H x 47.24"W x 13"D.Three open sections and mirrored top for displaying kids' books, toys, and more.Made of engineered birch plywood in a natural brown finish.Full assembly required.Holds up to 200 lbs. evenly distributed.Reachable height is great for toddlers through early elementary.Rounded edges prevent scratches from accidental contact.Easy to clean with a damp cloth.Meets or exceeds the GREENGUARD standard.15-year manufacturer limited warranty
The Round Activity Table is a versatile option for school classrooms, corporate training centers and your home. Enhance collaborative learning by grouping tables together. It will accommodate children of all ages, from 1st grade to adult. It features a 42" high pressure scratch, stain and warp resistant laminate top with a black edge band and 16 gauge tubular steel legs for increased stability. The top incorporates a protective underside backing sheet to prevent moisture absorption and warping. An attractive black powder coated finish protects the upper legs from scratches and height adjustable chrome lower legs give you the flexibility to raise or lower the table a full 9" in 1" increments. Self-leveling nylon floor glides keep the table from wobbling and protect your floor by sliding smoothly when you need to move it. This activity table provides a durable work surface for anything from computer labs to project meetings to laying out fabric in your sewing room..Round Activity Tables.Color: Gray; Material: Chrome, Laminate, Particleboard, Steel.Overall Dimensions: 42"W x 42"D x 21.25" - 30.25"H.Seats up to 5 People.Rated for Commercial Use.Warranty: 3 Years Limited.Popular Round Activity Table.Scratch and Stain Resistant Surface.1.25" Thick High Pressure Grey Laminate Top.Black Edge Band.16 Gauge Tubular Steel Legs.Black Powder Coated Upper Legs and Chrome Lower Legs.Legs Adjust in 1" Increments.Self-Leveling Nylon Floor Glides.Recommended Grade Level: 1st Grade - Adult.Recommended Seating Capacity: 4 Adults; 5 Children.No longer strictly used in daycares, schools and in the Church, Activity Tables can be used in the home or any environment where education is the focus and with colorful tops it'll entice children of all ages to learn.
Fill that new designated training room with this narrow rectangular plastic folding table. The space saving design can fit multiple tables in small and large rooms making it the perfect training style table for any classroom or training facility. Have people pick up test packets and informational pamphlets on this perfectly sized folding table. Cleanup is simple on this durable, waterproof top to pick up spills quickly. This 8 foot folding table seats 4 people on one side of the table allowing all at the table a clear view of the board and instructor. When you want to store or transport the legs lock underneath the top. Folding tables can be your go-to table to setup your products at convention centers..Rectangular Plastic Folding Tables.Color: White; Material: Metal, Plastic, Plastic: Polyethylene.Seats up to 4 Adults.Overall Dimensions: 18"W x 96"D x 29"H; Shape: Rectangle.Weight Capacity: 330 lbs. Evenly Distributed.Meets or Exceeds ANSI/BIFMA Standards; Rated for Commercial Use.Fully Assembled.Ready To Use Commercial Table.8' Folding Table.1.75" Thick Granite White Top is waterproof, impact and stain resistant.Gray Powder Coated Locking Legs with protective floor caps.Ideally sized for training rooms.Warranty: 1 Year Limited.Folding tables offer versatility as tables for holidays and parties or for the event facility to setup beautiful arrangements.
Encourage interaction between the young learners in your classroom with this Flash Furniture Bright Beginnings Hercules trapezoid wooden activity table. Kid-friendly rounded edges reduce the chance of accidental injury, while the neutral tone blends in with any decor and helps kids focus on the task at hand. This activity table serves as a play, dining, or craft space and comfortably accommodates up to three children. Composed of an ultra-strong GREENGUARD certified engineered wood tabletop and beechwood legs, this school table can support up to 300 lbs. of static weight. The surface is easy to clean and doesn't require a lot of maintenance. Assembly of the table takes less than 30 minutes..Commercial-grade trapezoid classroom activity table that can serve as a play, dining, or craft space.Composed of a birch plywood tabletop and beechwood legs in a glossy finish.Dimensions: 14.5"H x 47"W x 20.75"D.Seats up to three children.Kid-friendly design with rounded corners for safety.Meets or exceeds the GREENGUARD standard.Supports up to 300 lbs. of static weight.Easy to clean: just wipe clean with a damp cloth then dry.15-year manufacturer limited warranty
Great for classrooms and testing or media centers, the Safco Learn nesting rectangle desk gives students a flexible work surface to collaborate and innovate in any class size. The flip-top work surface saves setup time and permits nesting for compact storage when not in use. Need room to spread out and work? The laminated top provides 28" of ample work area or space to sketch ideas on the fly. Built for heavy usage and continuous movement, the flip-top nesting desk accommodates various applications and spaces..Nesting rectangle desk gives students a flexible work surface to collaborate and innovate in any class size.Made with a powder-coated steel frame for durability and a high-pressure dry-erase laminate top.Dimensions: 29.5"H x 28"W x 22.25"D.Assembly required.Nests together to save space, with 5" between desk surfaces when nested.Easy-to-use one-handed mechanism flips the desk top up and down; the handles are on either side of the desk.Moves easily throughout a space with four casters, two of which lock for safety.Weight capacity up to 200 lbs..Lifetime manufacturer limited warranty; 5-year warranty on laminate finish
Fill that new designated training room with this narrow rectangular plastic folding table. The space saving design can fit multiple tables in small and large rooms making it the perfect training style table for any classroom or training facility. Have people pick up test packets and informational pamphlets on this perfectly sized folding table. Cleanup is simple on this durable, waterproof top to pick up spills quickly. This 5 foot folding table seats 2 people on one side of the table allowing all at the table a clear view of the board and instructor. When you want to store or transport the legs lock underneath the top. Folding tables can be your go-to table to setup your products at convention centers..Rectangular Plastic Folding Tables.Color: Granite White; Material: Metal, Plastic, Plastic: Polyethylene.Seats up to 2 Adults.Overall Dimensions: 18"W x 60"D x 29"H; Shape: Rectangle.Weight Capacity: 330 lbs. Evenly Distributed.Meets or Exceeds ANSI/BIFMA Standards; Rated for Commercial Use.Fully Assembled.Ready To Use Commercial Table.2.63' Folding Table.1.75" Thick Granite White Top is waterproof, impact and stain resistant.Non-Locking Gray Powder Coated Cross Legs with protective floor caps.Warranty: 1 Year Limited.Folding tables offer versatility as tables for holidays and parties or for the event facility to setup beautiful arrangements.
Encourage interaction between the young learners in your classroom with this Flash Furniture Bright Beginnings Hercules semicircle wooden adjustable-height activity table. Kid-friendly rounded edges help reduce the chance of accidental injuries, while the neutral tone blends in with any decor to help kids focus on the task at hand. This activity table serves as a play, dining, or craft space and comfortably accommodates up to four children. Composed of an ultra-strong GREENGUARD certified engineered wood tabletop and height-adjustable powder-coated metal legs that adjust in 1" increments up to 9", this school table can support up to 300 lbs. of static weight and accommodates kids from pre-K to grade 2. The table features adjustable floor glides that provide a level work surface and prevent damage to indoor hard flooring. The surface is easy to clean and doesn't require a lot of maintenance. Assembly of the table takes less than 35 minutes..Commercial-grade height-adjustable semicircle classroom activity table that can serve as a play, dining, or craft space.Composed of a birch plywood tabletop in white and powder-coated metal legs in a beech finish.Dimensions: 15"-23"H x 59.06"W x 29.5"D.Seats up to four children.Kid-friendly design with rounded corners for safety.Meets or exceeds the GREENGUARD standard.Floor protector plastic glides prevent indoor flooring damage.Supports up to 300 lbs. of static weight.Easy to clean: just wipe clean with a damp cloth then dry.15-year manufacturer limited warranty
Encourage interaction between the young learners in your classroom with this Flash Furniture Bright Beginnings Hercules rectangular wooden adjustable-height activity table. Kid-friendly rounded edges help reduce the chance of accidental injuries, while the neutral tone blends in with any decor to help kids focus on the task at hand. This activity table serves as a play, dining, or craft space and comfortably accommodates up to four children. Composed of an ultra-strong GREENGUARD certified engineered wood tabletop and height-adjustable powder-coated metal legs that adjust in 1" increments up to 9", this school table can support up to 300 lbs. of static weight and accommodates kids from pre-K to grade 2. The table features adjustable floor glides that provide a level work surface and prevent damage to indoor hard flooring. The surface is easy to clean and doesn't require a lot of maintenance. Assembly of the table takes less than 35 minutes..Commercial-grade height-adjustable rectangular classroom activity table that can serve as a play, dining, or craft space.Composed of a birch plywood tabletop and powder-coated metal legs in a beech finish.Dimensions: 15"-23"H x 47"W x 24"D.Seats up to four children.Kid-friendly design with rounded corners for safety.Meets or exceeds the GREENGUARD standard.Floor protector plastic glides prevent indoor flooring damage.Supports up to 300 lbs. of static weight.Easy to clean: just wipe clean with a damp cloth then dry.15-year manufacturer limited warranty
This Flash Furniture Bright Beginnings commercial-grade mobile classroom storage unit offers a perfect solution for organization and safekeeping of essential educational materials. Features a space-saving storage with three storage shelves that make it a snap to keep classroom supplies readily at hand..Commercial-grade mobile classroom storage unit for organization and safekeeping of essential educational materials.Dimensions: 25"H x 16"W x 16"D.Features three space-saving storage shelves.Holds up to 100 lbs. static weight.Equipped with four locking caster wheels for safety.Made of birch plywood in a natural finish.Quick and easy assembly is required with included materials.Shelf size: 8.75"H x 14.5"W x 11.5"D.Easily reachable height is great for toddlers through early elementary students.Rounded edges prevent abrasions from accidental contact.Wipes clean with a damp cloth.Meets or exceeds the GREENGUARD standard.3-year manufacturer limited warranty
Encourage interaction between the young learners in your classroom with this Flash Furniture Bright Beginnings Hercules square wooden adjustable-height activity table. Kid-friendly rounded edges help reduce the chance of accidental injuries, while the neutral tone blends in with any decor to help kids focus on the task at hand. This activity table serves as a play, dining, or craft space and comfortably accommodates up to three children. Composed of an ultra-strong GREENGUARD certified engineered wood tabletop and height-adjustable powder-coated metal legs that adjust in 1" increments up to 9", this school table can support up to 300 lbs. of static weight and accommodates kids from pre-K to grade 2. The table features adjustable floor glides that provide a level work surface and prevent damage to indoor hard flooring. The surface is easy to clean and doesn't require a lot of maintenance. Assembly of the table takes less than 35 minutes..Commercial-grade height-adjustable square classroom activity table that can serve as a play, dining, or craft space.Composed of a birch plywood tabletop in white and powder-coated metal legs in a beech finish.Dimensions: 15"-23"H x 24"W x 24"D.Seats up to three children.Kid-friendly design with rounded corners for safety.Meets or exceeds the GREENGUARD standard.Floor protector plastic glides prevent indoor flooring damage.Supports up to 300 lbs. of static weight.Easy to clean: just wipe clean with a damp cloth then dry.15-year manufacturer limited warranty
Fill that new designated training room with this narrow rectangular plastic folding table. The space saving design can fit multiple tables in small and large rooms making it the perfect training style table for any classroom or training facility. Have people pick up test packets and informational pamphlets on this perfectly sized folding table. Cleanup is simple on this durable, waterproof top to pick up spills quickly. This 6-Foot folding table seats 3 people on one side of the table allowing all at the table a clear view of the board and instructor. When you want to store or transport the legs lock underneath the top. Folding tables can be your go-to table to setup your products at convention centers..Rectangular Plastic Folding Tables.Color: Granite White; Material: Metal, Plastic, Plastic: Polyethylene.Seat Capacity: 18.Overall Dimensions: 18"W x 70.8"D x 29"H; Shape: Rectangle.Weight Capacity: 220 lbs.Rated for Commercial Use.Fully Assembled.Ready To Use Commercial Table.5'9 Folding Table.Seats up to 3 Adults.221 lb. Static Load Capacity.1.75" Thick Granite White Top is waterproof, impact and stain resistant.Gray Powder Coated Locking Legs with protective floor caps.Ideally sized for training rooms.6 Year Limited (non moving metal parts) 2 yr Parts.Folding tables offer versatility as tables for holidays and parties or for the event facility to setup beautiful arrangements. Sold as 6/Pack
If you are in the market for a truly multi-functional table look no further. Use as extra dining surface for the holidays, a place to hold your sewing machine, indoor plants, pamphlets in your reception area or for your next seminar. This rectangular folding table is 8 feet long and can seat up to four adults making it beneficial in a multitude of settings that include the classroom, sewing room, solarium, banquet halls and in training rooms. The space saving design can allow multiple tables in a small to large setting making it the perfect style table for virtually any use. The durable blow molded top is low maintenance and cleans easily. This table has extendable feet that provide a stable work surface and the legs fold under the table to make storage more convenient and for better portability..Rectangular Plastic Folding Tables.Color: Granite White; Material: Metal, Plastic, Plastic: Polyethylene.Seats up to 4 Adults.Overall Dimensions: 18"W x 96"D x 29"H; Shape: Rectangle.Weight Capacity: 330 lbs. Evenly Distributed.Meets or Exceeds ANSI/BIFMA Standards; Rated for Commercial Use.Fully Assembled.Ready To Use Commercial Table.8' Folding Table.1.75" Thick Granite White Top is waterproof, impact and stain resistant.Gray Powder Coated Locking Legs with protective floor caps.Legs fold underneath top for flat storage.Warranty: 1 Year Limited.Folding tables offer versatility as tables for holidays and parties or for the event facility to setup beautiful arrangements.
Encourage interaction between the young learners in your classroom with this Flash Furniture Bright Beginnings Hercules semicircle wooden adjustable-height activity table. Kid-friendly rounded edges help reduce the chance of accidental injuries, while the neutral tone blends in with any decor to help kids focus on the task at hand. This activity table serves as a play, dining, or craft space and comfortably accommodates up to four children. Composed of an ultra-strong GREENGUARD certified engineered wood tabletop and height-adjustable powder-coated metal legs that adjust in 1" increments up to 9", this school table can support up to 300 lbs. of static weight and accommodates kids from pre-K to grade 2. The table features adjustable floor glides that provide a level work surface and prevent damage to indoor hard flooring. The surface is easy to clean and doesn't require a lot of maintenance. Assembly of the table takes less than 35 minutes..Commercial-grade height-adjustable semicircle classroom activity table that can serve as a play, dining, or craft space.Composed of a birch plywood tabletop and powder-coated metal legs in a beech finish.Dimensions: 15"-23"H x 59"W x 29.5"D.Seats up to four people.Kid-friendly design with rounded corners for safety.Meets or exceeds the GREENGUARD standard.Floor protector plastic glides prevent indoor flooring damage.Supports up to 300 lbs. of static weight.Easy to clean: just wipe clean with a damp cloth then dry.15-year manufacturer limited warranty
Encourage interaction between the young learners in your classroom with this Flash Furniture Bright Beginnings Hercules semicircle wooden adjustable-height activity table. Kid-friendly rounded edges help reduce the chance of accidental injuries, while the neutral tone blends in with any decor to help kids focus on the task at hand. This activity table serves as a play, dining, or craft space and comfortably accommodates up to four children. Composed of an ultra-strong GREENGUARD certified engineered wood tabletop and height-adjustable powder-coated metal legs that adjust in 1" increments up to 9", this school table can support up to 300 lbs. of static weight and accommodates kids from pre-K to grade 2. The table features adjustable floor glides that provide a level work surface and prevent damage to indoor hard flooring. The surface is easy to clean and doesn't require a lot of maintenance. Assembly of the table takes less than 35 minutes..Commercial-grade height-adjustable round classroom activity table that can serve as a play, dining, or craft space.Composed of a birch plywood tabletop in white and powder-coated metal legs in a beech finish.Dimensions: 15"-23"H x 33"Dia..Seats up to four children.Kid-friendly design with rounded corners for safety.Meets or exceeds the GREENGUARD standard.Floor protector plastic glides prevent indoor flooring damage.Supports up to 300 lbs. of static weight.Easy to clean: just wipe clean with a damp cloth then dry.15-year manufacturer limited warranty
If you are in the market for a truly multi-functional table look no further. Use as extra dining surface for the holidays, a place to hold your sewing machine, indoor plants, pamphlets in your reception area or for your next seminar. This rectangular folding table is 6 feet long and can seat up to three adults making it beneficial in a multitude of settings that include the classroom, sewing room, solarium, banquet halls and in training rooms. The space saving design can allow multiple tables in a small to large setting making it the perfect style table for virtually any use. The durable blow molded top is low maintenance and cleans easily. The table legs fold under the table to make storage more convenient and for better portability..Rectangular Plastic Folding Tables.Color: Granite White; Material: Metal, Plastic, Plastic: Polyethylene.Seats up to 3 Adults.Overall Dimensions: 18"W x 72"D x 29"H; Shape: Rectangle.Weight Capacity: 220 lbs. Evenly Distributed.Meets or Exceeds ANSI/BIFMA Standards; Rated for Commercial Use.Fully Assembled.Ready To Use Commercial Table.6' Folding Training Table.1.75" Thick Granite White Top is waterproof, impact and stain resistant.Gray Powder Coated Locking Legs with protective floor caps.Legs fold underneath top for flat storage.Warranty: 1 Year Limited.Folding tables offer versatility as tables for holidays and parties or for the event facility to setup beautiful arrangements.
Encourage interaction between the young learners in your classroom with this Flash Furniture Bright Beginnings Hercules round wooden adjustable-height activity table. Kid-friendly rounded edges help reduce the chance of accidental injuries, while the neutral tone blends in with any decor to help kids focus on the task at hand. This activity table serves as a play, dining, or craft space and comfortably accommodates up to four children. Composed of an ultra-strong GREENGUARD certified engineered wood tabletop and height-adjustable powder-coated metal legs that adjust in 1" increments up to 9", this school table can support up to 300 lbs. of static weight and accommodates kids from pre-K to grade 2. The table features adjustable floor glides that provide a level work surface and prevent damage to indoor hard flooring. The surface is easy to clean and doesn't require a lot of maintenance. Assembly of the table takes less than 35 minutes..Commercial-grade height-adjustable round classroom activity table that can serve as a play, dining, or craft space.Composed of a birch plywood tabletop and powder-coated metal legs in a beech finish.Dimensions: 15"-23"H x 33"Dia..Seats up to four children.Kid-friendly design with rounded corners for safety.Meets or exceeds the GREENGUARD standard.Floor protector plastic glides prevent indoor flooring damage.Supports up to 300 lbs. of static weight.Easy to clean: just wipe clean with a damp cloth then dry.15-year manufacturer limited warranty
With its simple lines and slim silhouette, this indoor-outdoor metal cafe dining table is sized right for small spaces. Compact in design, the tabletop is 23.75 inches square and has a 2 inch lip with rounded corners. At the base, the legs extend to 27.75 inches in width. A cross-brace under the tabletop provides increased support and stability. Rubber floor glides protect your floor by sliding smoothly when you need to move it. Galvanized steel construction and a powder coat finish ensure durability and easy maintenance. Designed for both commercial and residential use, this trend-setting table is a great choice for your restaurant's outdoor dining area or your kitchen at home..Metal Colorful Restaurant Table.Color: White; Material: Galvanized Steel, Rubber.Seats up to 2 Adults.Overall Dimensions: 27.75"W x 27.75"D x 29"H; Shape: Square.Weight Capacity: 300 lbs. Evenly Distributed.Meets or Exceeds ANSI/BIFMA Standards; Rated for Commercial Use.Assembly Required.Metal Cafe Table.Top Size: 23.75" Square.Base Size: 27.75"W.2" Thick Edge Top.White Powder Coat Finish.Galvanized Steel Construction.Cross Brace provides extra stability.Protective Rubber Floor Glides.Designed for Indoor and Outdoor Use.Designed for Commercial and Residential Use.1 Year Limited Warranty.Create a unique dining experience in your dining room, kitchen or restaurant with colorful metal tables.
Bring your team together in an open or private work environment with the Bush Business Furniture 42W Round Conference Table. At just the perfect size, the multipurpose table comfortably seats 4 in a collaborative classroom or training area, private office, or small conference room without taking up too much space. A finished underside prevents snagged clothing, while a classic wood base provides durability and stability on any floor. The commercial-grade Round Conference Table meets ANSI/BIFMA quality test standards and comes with a Bush Business Furniture Limited Lifetime Warranty. Browse the complete line of Conference Tables, available in a variety of styles and finishes to complement your office. American made with U.S. and imported parts..Thermally fused laminate surface resists scratches and stains to give the Conference Table a professional look for years to come.Wood base provides strength and stability.Engineered Wood in Mocha Cherry.Assembled Dimensions: 42W x 42D x 30H.Durable edge banding and 1 inch thick top fend off dings and dents.Round Conference Table provides comfortable seating for 4 people.Multipurpose design perfect for conferences, meetings, training and education spaces, break rooms and more.Bush Business Furniture Conference Tables available in a variety of sizes and finishes with multiple base options.Meets ANSI/BIFMA standards for safety and performance.American made with U.S. and imported parts.Commercial quality backed by Limited Lifetime Warranty.Assembly Required.When you need to outfit a meeting room, conference room or training space, our tables are up to the task
This Flash Furniture Bright Beginnings commercial-grade mobile art center for two is a perfect addition to any classroom. The easel features locking caster wheels for safety, and it includes magnetic chalkboard with whiteboard surfaces..Commercial-grade mobile art center for two is a perfect addition to any classroom.Dimensions: 48.25"H x 24.5"W x 22"D.Locking caster wheels for safety.Frame is made of engineered birch plywood in a natural brown finish.Includes magnetic chalkboard and whiteboard surfaces.Shelf size: 13.25"H x 9.75"W x 17"D.Storage size: 3.75"H x 23.25"W x 2.75"D.Features space-saving storage with upper paper roll holder, storage trays, and lower shelf.Rounded edges prevent abrasions from accidental contact.Holds up to 50 lbs. of static weight capacity.Wipes clean with a damp cloth.Meets or exceeds the GREENGUARD standard