Self-acting blades
The damper responds to the pressure across it without needing a separate electrical opening command.
PRODUCT / TECHNICAL DATA Cleanroom Ductwork & AccessoriesSpecifications / Configurations / Procurement
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Cleanroom Ductwork & Accessories
Backdraft Damper
Product specifications
Common specification options
| Brand | ST |
|---|---|
| Operation | Pressure-operated backdraft blades |
| Body | Galvanized steel or stainless steel |
| Connection | Flanged |
| Size | Custom |
| Blade arrangement options | Gravity / pressure-operated closure |
| Installation orientation options | Horizontal / vertical airflow arrangement |
| Frame options | Flanged casing |
| Seal options | Blade-edge seals |
| Dimensions | Custom duct section and casing depth |
Customization availableDuct section, casing length, actuator connection and mounting flanges can be customized.
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Backdraft Damper restricts reverse airflow through a duct when the associated fan stops. Pressure in the intended direction opens the blades; a reverse pressure difference encourages closure, limiting unwanted flow through an idle branch.
FEATURES AND BENEFITS
How it helps
Inline connection
A flanged casing fits between duct sections at the branch that needs reverse-flow control.
APPLICATIONS
Where it is used
Parallel fan branches
Reduce air returning through a stopped fan while another connected branch operates.
Exhaust duct outlets
Limit reverse drafts through a ventilation path between fan operating periods.
SELECTION GUIDANCE
Choosing the configuration
Orientation matters
Select the blade arrangement for horizontal or vertical airflow and keep the blades free to move; the installation direction is part of the mechanism.
PROCUREMENT / INQUIRY
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