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T-20 Tamper Proof Screws
Blades are parallel to the longest dimension
Designed to handle high volumes of air with horizontal flow
Spiral Diffuser Radius Flush Mount Diffuser Single Deflection with Damper
Tamper Proof Screws - stainless steel TORX Center Pin
4" 3 Hour Vertical Mount Fire Door 2665-12 Smoke-Fire Damper T-20 Tamper Proof Screwsh3. Standard Features * 2661 Square or rectangular fire door for vertical mount only. Maximum dimension 60x60. For damper free area chart A click here * 2663 Out of Airstream fire door. Square or rectangular for vertical mount only. Maximum dimension 60w x 52h. For damper free area chart B click here * 2665 Round fire door for vertical mount only. Available 4" thru 52" round. * 3 hour rated * UL and California State Fire Marshall approved * 4 1 4"
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