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Exceeds temperature limit of most plastics and is an economical alternative to specialty fabric duct
These are simple to install and infinitely adjustable
Diameters are +/- 1/8 inch
Temperature range:–65°F to +200°F
not compatible with Heavy Gauge or airtight systems
Flap Exhaust Valves (Flap Stacks) Trapeze Hanger Exceeds temperature limit of mostA resourceful after the fan product, flap exhaust valves, or stacks, are designed to open, like bird wings, with the airflow and close when the system is not exhausting. The lightweight and balanced blades produce minimal resistance to exhaust. The design of the housing and blades channel rainwater away from the opening and allow it to drain without intrusion into the ducting. Available in 4" to 32" diameter (contact for custom sizes). Also known as
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