Comparison
Tape-and-Cardboard vs. Tempvent
Taping a piece of cardboard or furnace filter over a vent is the construction default. Here’s why it reliably fails — and what a purpose-built cover does differently.
| Factor | Tape + Cardboard | Tempvent |
|---|---|---|
| Attachment | Tape on subfloor surface | Gravity-seated into opening |
| Seal quality | Gaps at all edges | Fits register opening perimeter |
| Filter included | No | Yes — replaceable |
| Moisture resistance | Cardboard degrades | 3D-printed, moisture-resistant |
| Thermal stability | Tape adhesion weakens as temperatures shift | No adhesive — gravity only |
| Leaves residue | Tape residue on subfloor | No fasteners, no residue |
| Cost | Near-zero (scrap materials) | $20–25 per cover |
Ready to stop using tape?