643-S&P model 643 wall cap. Aluminum natural finish, built in backdraft damper. For 8″ round duct. December 20, 2019 | No Comments 643-S&P model 643 wall cap. Aluminum natural finish, built in backdraft damper. For 8″ round duct. Add To Quote Request This product is already in quote request list View Your Quote Cart SKU: AAIS-SP-643-S&P model 643 wall cap. Aluminum natural finish, built in backdraft damper. For 8" round duct. Category: S&P FF Ceiling Ventilators Description Description S&P model 643 wall cap. Aluminum natural finish, built in backdraft damper. For 8″ round duct. Related Related products 981L-S&P in-line adapter. 8″ round intake (FF200/250/300). Read more Add To Quote Request This product is already in quote request list View Your Quote Cart FF700-S&P 700 CFM ceiling mounted ventilator. 120 VAC. Read more Add To Quote Request This product is already in quote request list View Your Quote Cart RD1-S&P UL rated, 4 hour ceiling radiation fire dampers. (FF100 thru FF300) Read more Add To Quote Request This product is already in quote request list View Your Quote Cart FF250-S&P 250 CFM ceiling mounted ventilator. 120 VAC. Read more Add To Quote Request This product is already in quote request list View Your Quote Cart Related