Spiral Pipe Diffuser with Transition Box SD52-18X8G Damper:Without Damper 2" ADC compliant round collar

2" ADC compliant round collar with a bead for ease of installation

904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 4" Duct Opening  (front blades parallel to shortest dimension)

Stamped steel face with roll formed frame

Standard Features *

Heavy gauge cold roll steel

Spiral Pipe Diffuser with Transition Box SD52-18X8G Damper:Without Damper 2" ADC compliant round collarSD52 Transition Box Spiral Pipe Grille (Single Deflection) Standard Features Single deflection transition box mount spiral pipe grille Blades are parallel to the shortest dimension Allows for 2 way airflow adjustment Nylon bushings on adj. blades prevent metal on metal rattle Curved saddle with gasket provides airtight fit to spiral pipe Product sizes available to fit spiral pipe diameters 8 48." Spiral pipe diameter must be 4 larger than width of