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Bypass Air Dampers and Weatherhoods
Greenheck's bypass air dampers mix ambient air with exhaust air from the laboratory space. On variable
volume lab exhaust systems, bypass air damper modulation allows reduction in lab exhaust flow while
maintaining constant fan discharge flow rate, velocity, and plume rise.
A weatherhood with the stainless steel
1
birdscreen protects the bypass damper,
actuator and damper controls from the
ambient elements. Damper actuators
and controls are mounted outside of the
contaminated exhaust allowing servicing
without accessing the contaminated
plenum interior.
Bypass dampers utilize opposed blades for
2
flow control and are sized for each unique
system application. Construction includes
a polyester resin coated and baked, heavy-
gauge steel formed casing and airfoil
blades. Jamb seals, bearing and blade
shafts are stainless steel. Damper blade
edge seals are silicone.
Bypass dampers are available with
3
optional factory-mounted electric
modulating or pneumatic actuators.
Bypass Air
Damper
Bypass Air
Lab Exhaust
(Vertical Intake)
Vektor Bypass Damper Features and Options
Standard Construction Material (Frame, Blade)
Stainless Steel Construction Material (Frame, Blade)
Hi-Pro Polyester Coating
Blade Style
Electric Actuator
Isolation Damper
Bypass Air Plenum
Lab Exhaust
(Horizontal Intake)
1
2
What Does Bypass Air Do?
As the lab exhaust flow requirement
diminishes, the bypass air damper opens,
reducing the lab exhaust flow and adding
ambient air to the reduced lab exhaust
flow. The added bypass air assists in the
dispersion of hazardous lab effluent while
maintaining constant fan discharge flow,
velocity, and plume rise.
When the lab exhaust flow requirement
increases, the bypass air damper closes
and reduces the amount of added
ambient air to the increased lab exhaust.
Bypass air dampers are typically
controlled with modulating actuators tied
into the laboratory control system.
Vektor-M Series
Vektor-C Series
Galv. Steel
Optional
Optional
Airfoil
Optional
3
Galv. Steel
Optional
Optional
Airfoil
Optional
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