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4x16-5 Ventilation System Insulated Spiral Duct
 This lightweight 4" insulating air duct is manufactured with a
helically shaped internal crimped galvanized steel strip. The strip
locks together with the aluminum foil in order to form an air tight and
leak proof lock system. It ensures excellent strength, making it
perfect as a flexible solution for a broad range of venting
requirements from low or high pressure heating, as well as for
ventilation to air conditioning application.
 Features:
- Minimum echoes possible
- Self-supporting, leaking proof & corrosion resistant
- Completely flexible ducting for routine exhausting
- Reinforced double-layer aluminum foil construction
- Dimension: 4"Diameter. x 16-1/2ftL
- Can be compressed to a 9" compact cylinder Size
- Ideal for HVAC, bath and general ventilating applications
Free Gift: 2x Stainless Steel Bridge Clamps,
compared to traditional band ones, assure a tight and intact seal at
the venting connection for both interior and exterior helix ducting. 
Package Content:
- 1 x Black 4" x 16-1/2ft Ducting
- 2 x Bridge Clamps
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