Gravity fans designed to facilitate breathing in natural gravity or negative pressure systems. The devices have a low silhouette in the form of a fabric hood.

From 0 to 109,800 cfm
Up to 0.35 inch of water gauge.

 
All products are rigorously tested for aerodynamic performance, noise levels, structural integrity, durability, mechanical performance, environmental impact, temperature, fire safety, vibration levels and more.

Greenheck is based in Wisconsin (USA), has a research center and production facilities in different parts of the world.
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