Airtec TuffBox quick rough-in polymer register box for HVAC systems

TuffBox Register Box is a heavy, 1-piece durable polymer shell. Virtually air-tight molded design delivers 100% of air flow. Using an innovative stepped design supporting 3 duct sizes, collars are 1" & beaded to hold flexible duct in place while securing strap.


  • Stepped Collar for multiple duct sizes
  • Collar tabs easily tear away unneeded sections - allow on-site adjustment &labor savings
  • Mounting Clip accommodates thicknesses up to 1-1/4"
  • 5/8" standoffs provide correct depth to accommodate strapping/furring used with drywall
  • Flange is flexible to conform to drywall backing, virtually eliminating leakage between grille and box
model description usually ships price QTY
MHS Airtec 6x6 register box. 4,5,6 inch collars. [81966] 1 Day. In-stock $15.64
MH Airtec 8x8 register box. 6,7,8 inch collars. [81968] 1 Day. In-stock $17.85
MHL Airtec 10x10 register box. 8,9,10 inch collars. [81970] 1 Day. In-stock $22.02
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Do you have questions about the products on this page?

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#1 Q:   Does the 4,5,6 in diffuser have a 9 inch botton square?
A:   6x6 inch square opening size plus the 1.5 inch flange all around.

       Asked on 2018-09-01 by Shelly

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