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Because...
A Zip-a-Duct™ is the diffuser itself - no extra grills are needed
Air leaves the duct from diffusers on both sides along the length of a Zip-a-Duct™. This is a unique feature to supply equal air volumes to the sourrunding space and to keep both noise and draft issues at an absolute minimum level. This advantage is very unlike spiral ducts of sheet metal using grills or diffusers and is much quicker and easier to install.
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| Soft outlet from Zip-a-Duct™. The full length of the straight sections are diffusers themselves. Low velocity. No noise accur. |
Concentrated air outlet from spiral duct with high air velocity. Noise may accur. |
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