Adding a greenhouse inflation blower fan between two layers of poly film is one of the most effective and affordable ways to insulate your greenhouse or high tunnel. The blower continuously pushes air between the two film layers, creating a 3–9" dead air space that acts as a thermal buffer — keeping heat in during cold nights and reducing the energy needed to maintain growing temperatures year-round.
 
Benefits of double-layer film with an inflation blower fan:
Excellent insulation through a continuous dead air space
Retains heat collected throughout the day
Makes your greenhouse or high tunnel more energy efficient
Reduces heating costs for year-round growing
Creates a drier internal environment, reducing disease pressure
 
Available in two sizes:
3-bolt Round Mounting Bracket
60 CFM
120 VAC, pre-wired
6 ft cord included
Ideal for greenhouses and high tunnels up to 1,500 sq ft
4-bolt Square Mounting Bracket
148 CFM
120 VAC, pre-wired
6 ft cord included
Ideal for greenhouses and high tunnels over 1,500 sq ft
 
All fans include a damper to adjust airflow between layers. Blower fan and mounting bracket are sold separately — be sure to select the correct bracket for your fan size.