Hart & Cooley Series 21 10" Installation Frame for #24 Diffuser

Features: All-steel construction Golden Sand enamel finish Used but not furnished with #24 ceiling diffusers. Not required when using #22 Butterfly Damper or #23 Opposed Blade Damper. Cannot be used with SD or SDD. Available sizes (inches): 6, 8, 10, 12, 12, 14, 16, 18, 20, 22, 24