F4P Duct Plus Premium Grade Duct Tape - 1.88" x 60 yd, Gray

F4P Duct Plus is flame retardant, and the tape is UL 723 and ASTM E84 compliant. That is the pair of ratings a mechanical inspector looks for on tape used around duct runs and plenum-adjacent work, so if the spec on the drawing calls for a flame retardant tape tested to ASTM E84 surface burning, this one answers it.

The service range on F4P Duct Plus is 40 F to 200 F. That covers hot attic and mechanical room conditions on the top end. The bottom end matters more than people expect: below 40 F the rubber based adhesive is outside its stated range, so cold weather exterior work in winter is where this tape stops being the right choice. Warm the surface and the roll before applying if you are near the low end.

Cloth backed duct tape like F4P Duct Plus is a repair and general purpose tape, not a duct sealant. Sealing supply and return joints to code is a job for UL 181 rated foil or mastic, because cloth tape adhesive is not qualified for continuous duct sealing. Where this tape earns its place is everything around the job: bundling, temporary closures, patching insulation jacket, holding poly sheeting, marking, and site repairs on metal, plastic, wood or masonry. Its flame retardant construction and UL 723 / ASTM E84 compliance are why it is accepted in mechanical spaces where a plain hardware store tape would not be.

The adhesive is rubber based with high tack and high shear, which is the combination that grabs on first contact and then resists creep once a load hangs on it. The description covers metal, plastic, wood and masonry. Practical limit: no adhesive bonds through dust or oil, so wipe galvanized duct before you run the tape, and on masonry expect the bond to be only as good as the loose surface it lands on.

Yes, F4P Duct Plus is USA origin, which is what a government, school district, or federally funded MRO buyer needs confirmed before it can go on a domestic preference order.

F4P Duct Plus is a nominal 2 inch tape, listed at 1.88 inches actual width by 60 yards, which is the standard contractor roll size. One roll weighs about 1.41 lb. The 1.88 versus 2 inch difference is just nominal versus actual and it fits any standard 2 inch tape dispenser or gun.

One configuration: gray, 2 inch nominal width, 60 yard roll. Gray is the standard trade color and it takes marker legibly for labeling circuits, runs, or dates on a job.