DC Series – Terminator Diffuser Collar

Dimensions: SIZES: 4”, 5” and 6”

Terminator (DC Series) from Primex is a termination for round ducting and a collar for diffusers and grilles in air distribution systems. The strong, industrial-grade plastic is durable and lightweight. Terminator is the solution to sloppy, inaccurate termination of HVAC ducting. This unique product is ideal for HRV, ERV and in-line fan supply and exhaust terminations.

Simply hold it in place on the joist or stud; it attaches in seconds. The 90° back-stop ensures a level mounting position. Ducting fits over the top collar and the rigidity of the bottom circular opening ensures the diffusers and grilles stay snug against the finished surface.


• Quick and easy installation with no sharp edges.
• Can be used for ceiling or wall terminations.
• Perforated mounting flanges for screws or nails
• Preset for 1/2 and 5/8-inch drywall.
• 90° back-stop for a level, uniform installation.
• Off-set from joist for easy installation of ducting and clearance for application of tape or sealer.
• Duct-Stop-Point ensures no screws penetrate the collar and impede the insertion of the grille.
• A rigid bottom flange guarantees the drywall router tool conforms to the circular opening.
• Bottom flange for a permanent air seal.
• V-shaped indentations on bottom edge for centering with previously installed fixtures.


adobe-PDF-iconTerminator Diffuser Collar SPEC SHEET

Installation Overview Video:


DC4  Terminator 4”, black  25/box
DC5  Terminator 5”, black  25/box
DC6  Terminator 6”, black  25/box