AccelaFrame™ HD Greenhouse, 12 ft. x 20 ft. x 9 ft.

Model #70691
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Grow healthier plants while extending the growing season. The revolutionary AccelaFrame™ System has been engineered to offer quicker frame assembly and disassembly, stronger frame, and easier storage.

See how the game-changing AccelaFrame™ technology cuts build time from hours to minutes.



SKU 70691
Assembly Manual Download (PDF)
Style Arch
Material Polyethylene 5.5 oz
Frame Color Gray
Color Translucent
Door Type 2 Double Zippered Doors, Front and Rear
Size 12 x 20 x 9 ft.
Width 12 ft.
Length 20 ft.
Height 9 ft.
Rib Tubing Diameter 1.65 in.
Total Storage Area 247.41 sq. ft.
Total Storage Volume 1790.37 cu. ft.
Assembly Required Yes
Assembled Exterior Dimensions Width 147.43 in.
Assembled Exterior Dimensions Depth 241.65 in.
Assembled Exterior Dimensions Height 107.48 in.
Assembled Interior Dimensions Width 144.13 in.
Assembled Interior Dimensions Depth 238.35 in.
Assembled Interior Dimensions Height 105.83 in.
Door Opening Width Top 40
Door / Entrance Width Bottom 40 in.
Door / Entrance Height Outside 88 in.
Wall Height 63.87 in.
Peak Height 43.61 in.
Warranty 1 Year Limited
Waterproof Yes
Water-Resistant Yes
AccelaFrame™ HD Greenhouse 12 x 20 x 9 ft. is rated 4.8 out of 5 by 5.
Rated 5 out of 5 by from Greenhouse Easy to install. Well built. The ratchets could be a better quality . Overall a great purchase.
Date published: 2017-05-18
Rated 5 out of 5 by from Great Seasonal Greenhouse! After many years of building seasonal greenhouses (wood, PVC to scaffolding frames) for my wife's tropical plants, I deceided to purchase the ShelterLogic - AccelaFrame HD Greenhouse 12' X 20' X 9'. It shows having 2 persons to assemeble and would be recommended, but it only took about 2 hours to errect it myself (30+ minutes to set the anchors in the good ole Texas soil). Overall this was fairly an easy project, is built of quality materials and looks much better than what I've built in the past. Great Seasonal Greenhouse.
Date published: 2016-12-30
Rated 5 out of 5 by from I like it! I bought this to replace a similar sized unit that was lost in hurricane Matthew. the frame assembled very quickly, one person 30 minutes. It did take another day 8 man (person) hours to finish the build but that is about 20 hours less than the first unit. The snap up frame seems really strong. I would like to see the instructions contain some written hints. For example: Don't anchor the frame to concrete until you get the support pieces in.
Date published: 2016-10-24
Rated 5 out of 5 by from Perfect I bought this greenhouse been growing with for the last couple of months and i gotta say it is worth every penny. Holds up to high winds with the anchors given. Cools down with easy lift ups and windows. I wanna get me a round top next. Not to mention shelter logics customers service was outstanding. Had an part missing and they got to me fast. Thanks for the awesome product.
Date published: 2016-05-31
Rated 4 out of 5 by from Green house Bought a green house and set it up. Was not to bad to set up with two people. Very happy with the product.
Date published: 2017-05-30
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Hi there, what is the weight of the greenhouse? thanks!

Asked by: edc
Hello, This unit weighs 223 lbs. Thank you
Answered by: Customer Service
Date published: 2019-02-22

Can a thermostat heater be okay to use in this greenhouse? I only need to keep the temperature to around 60-65 degrees.

Asked by: pondguy
Hello, We advise against smoke or use open flame devices (including grills, fire pits, deep fryers, smokers or lanterns,etc.) in or around the shelter. Do not store flammable liquids(gasoline, kerosene, propane, etc.) in or around your shelter. Do not expose top or sides of the shelter to open fire or other flame source. If you have any additional questions please feel free to reach out to us at 1-800-932-9344. Thank you
Answered by: DaniL
Date published: 2018-12-11

Can a electric heater be used in side going to use to start vegetable seeds in late winter for spring plant

Asked by: Philip57
Hello, These are a fabric cover for the greenhouses so we would advise against using the heater in the shelter. If you would like to discuss your options further please give us at call 7 days a week at 1-800-560-8383. Thank you
Answered by: DaniL
Date published: 2018-10-22

Is there a roll-up door replacement? Something with hinges or slides?

Asked by: GoJoeGo
Hello, We do not have a different door option available for this shelter. If you have any additional questions, please let us know. Thank you
Answered by: ShelterLogic
Date published: 2017-05-28

Are these greenhouses capable of year round use? Heatable? We live in zone 8, southern NM.

Asked by: GoJoeGo
Hello, This greenhouse can be left up all year round however, it is intended to extend the growing season and get a head start. We would not recommend keeping plants in it when temperatures are low and we do not recommend putting a heat source inside. Thank you
Answered by: ShelterLogic
Date published: 2017-05-28

How much is the replacement cover for the AccelaFrame HD Greenhouse 12x20x9?

Asked by: 303Greens
Hello, The replacement cover kit for the 12x20x9 Accelaframe greenhouse is $229.99 USD plus shipping. Thank you
Answered by: ShelterLogic
Date published: 2017-04-09

"Hi" Are the anchors included? If you were to buy ratchets how many would you need for this greenhouse?

Asked by: Gloria
Hi Gloria, There are four 15" auger anchors included for setting your shelter up however, we do recommend using 30" anchors at every leg for a more secure anchoring option. This shelter does come with ratchets for installing the end panels and the cover. If you have any additional questions please let us know. Thank you
Answered by: ShelterLogic
Date published: 2017-03-16

Does the sides roll up?

Asked by: 66vet
Hello, Yes the sides do roll up approximately 8 inches on the side. If you have any additional questions, please let us know. Thank you!
Answered by: ShelterLogic
Date published: 2017-04-23
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Features & Benefits

Big quality features. Value priced. Learn more about this product below.

  • Put up the greenhouse in early spring to start seedlings. Take it down during the hot summer months. Quickly rebuild to extend the growing season and protect plants from late season frost.

  • AccelaFrame™ Quick Frame Assembly System – Cuts frame build time from hours to as little as 30 minutes

  • Increased Building Strength – Overall 2x stronger than comparable shelters

  • Less Chance of Making Assembly Errors – Joints are pre-assembled in the box and cross rails feature simple snap-in connections between the ribs

  • Less Intimidating Assembly – Drastic reduction in loose parts in the box which decreases time to assemble

  • Please refer to the ANCHOR GUIDE included with the product. Proper anchoring is crucial and is the responsibility of the consumer.