Dayton 3G-OTH-74708 — Technical Specifications

Name: Dayton 3G-OTH-74708 39.75"H-W 4.5"L Aluminum Backdraft Dampr: For 40 in Fan, For 40 in Nominal Duct Dia, Single Panel (MPN 3HHN2). Key specifications — Airflow Direction: Vertical; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2250 fpm; Mounting Position: Horizontal.
Brand: Dayton

The Dayton 3HHN2 is a universal-mount backdraft damper designed for use with a 40-inch fan and 40-inch nominal duct diameter. It features a single-panel, flat blade construction with aluminum material, supporting vertical airflow direction and horizontal mounting position. The damper has a maximum air velocity of 2250 fpm and measures 39.75 inches in height and width with a 4.5-inch length.

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Technical Specifications

Parameter	Value
Type	For 40 in Nominal Duct Dia, Single Panel
Brand	DAYTON
Blade Type	Flat Blade
Airflow Direction	Vertical
Mounting Position	Horizontal
Maximum Air Velocity	2250 fpm
Manufacturer Part Number	3HHN2