Dayton 16D550 Wall Collar 12 in 16 1/4 in Galvanized Steel

Dayton 12-Inch Wall Collar for Fan Installation

This galvanized steel wall collar is built to frame a 12-inch blade opening in a fixed ventilation system. It ships with four mounting angles and four side panels so the assembly can be secured directly to the wall opening. The 20-gauge construction provides a rigid, closed-base frame that resists flex during fan operation. Installers working on commercial or agricultural exhaust projects will find the pre-drilled flanges align with standard cut-out dimensions.

Sustained Airflow and Structural Integrity

Under continuous exhaust or supply airflow the collar maintains its shape without rattling or bowing at the corners. The galvanized finish resists surface corrosion when the unit is mounted in damp or unconditioned spaces. Because the base is closed, debris and back-drafts are blocked from entering the wall cavity during off-cycles. The 16 1/4-inch overall height and width keep the mounting footprint predictable for repeated installations.

12-Inch Blade Compatibility Decides Fit

The collar is sized exclusively for a 12-inch blade diameter and a 17 5/8-inch square cut-out. If the fan blade or the wall opening differs from those dimensions the collar will not seal or fasten correctly. No adapter rings or reducers are included, so the installer must verify the exact cut-out before ordering.