Exhaust Fan Size:12" The roof panels are twin-wall

The roof panels are twin-wall polycarbonate

The sturdy construction and superior insulation of the RIGA 3 Greenhouse make it ideal for year-round gardening

7Total Product Weight: 476

With the Americana™ you have room to grow and room to share your love of gardening

Exhaust Fan Size:12" The roof panels are twin-wallProduct Description: Exhaust fan keeps air moving through your Janssens or Riga greenhouse to create the best possible growing environment. Available in three sizes. The exhaust fan works great to reduce the strain of heat on your crops. 12" Exhaust Fan: recommended for RIGA 2, 3, 4, and J Vics, and VI 23; works best with VC115 C thermostat controller. Unit requires a 12. 25" x 12. 25" opening. Usually positioned in a high location in the back wall.