What is This Piece of Equipment?

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The discussed equipment is likely an automatic damper connected to the exhaust fan, designed to regulate airflow and incorporate fresh air into the airstream. Its function may include diluting toxic gases before they are released into the atmosphere. The presence of a screen suggests it also prevents birds from nesting in the intake. If the fan operates at a constant velocity, the damper may serve a bypass function to maintain optimal static pressure in the exhaust duct. This setup is essential for ensuring compliance with codes that require a constant stack velocity.
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Hello, I need some help determining what this piece of equipment is. It is currently attached to the inlet of my exhaust fan and controlled by some electrical signal. I am thinking it may be a pressure relief damper, but not sure if I am correct. I could not find any nameplate/set point for the piece. Could you guys please help?
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It seems that you have a similar thing installed for the other fan.

It should be an automatic damper to incorporate some fresh air into the airstream that is exhausted from the building.
It could be a mean to dilute toxic or bio-hazardous gases prior to release those upwards into the atmosphere.

The screen is just to prevent birds from nesting inside that intake.

Please, see:
https://www.greenheck.com/products/air-movement/fans/laboratory-exhaust-fans

If the motor of the fan is constant velocity, that automatic damper could also have a by-pass function, so the static pressure in the exhaust duct and laboratory hoods is kept constant and optimal for lab operation.

Please, see:
https://content.greenheck.com/public/DAMProd/Original/10017/VSC_Comp_Guide.pdf
 
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It's likely there to maintain a constant 3,000 fpm stack velocity(code required in some cases) despite receiving a variable exhaust volume from the building.
 

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