20'x100' Greenhouse Frame Quonset Sidewall Height/Truss Spacing:4'/5' Intake shutters are designed to

Intake shutters are designed to bring fresh air into your greenhouse and may also be used for free-air exhaust

it is made in the USA and comes with a manufacturer supported warranty

CO2 and also provides an accurate VPD measurement

Prevents the light from impacting nutrient-rich water

20'x100' Greenhouse Frame Quonset Sidewall Height/Truss Spacing:4'/5' Intake shutters are designed toHortitech greenhouse frames are built for resilience and are competitively priced. They are made from high grade galvanized steel that can withstand wind and snow. This product is the greenhouse frame only. When you buy greenhouse frames from Hortitech, you get greenhouse frames direct from the manufacturer that are 100% American made with no cheap pre fabricated foreign parts. This product is ONLY the steel greenhouse frame. All steel, purlin, and