3M™ Venting Tape 3294. The non-woven, synthetic backing is conformable with good burst strength for effective sealing and minimal foaming voids to help reduce clean-up. 3M™ Venting Tape 3294 is a pink non-woven, synthetic backing with a strip-coated low-tack pressure sensitive acrylic adhesive for use in various venting applications requiring high outgassing rates.