Oversized Gravity-Furnace Conversion Solid Metal Floor Grille
Heavy 1/8-inch solid brass or matte black steel grilles custom-cut for large 10x12, 12x14, 14x18, and odd rectangular openings left by early gravity-warm-air furnaces.
- Custom sized to exact vintage cast-iron boot openings
- Available in 1/8" Matte Black Steel, Solid Brass, or 304 Stainless
- Eliminates costly hardwood floor patching during HVAC retrofits
Replacing a cracked cast-iron gravity-furnace grate usually means hunting salvage yards for months or patching antique oak strip flooring. We cut single-piece heavy 1/8-inch solid plates to match the exact rough boot left in your floor.
Wide 1/4-inch web bars and 0.125-inch plate thickness give firm support across oversized hallway and parlor return openings.
Enter Exact Measurements BelowEnter Your Exact Measurements
Pre-loaded with the Gravity-Furnace Oversized Grille specification. Adjust width, height, border, or solid metal below for instant CAD geometry and pricing.
Duct Opening Measurements
How to measureMeasure the rough floor or wall duct opening, not your old cover. We add the solid border around all four sides.
Solid Metal & Finish
Matte Black SteelHeavy cold-rolled steel finished in durable fine-texture architectural matte black.
Cut Pattern
CAD proof verified before cutting · Ships in 6–8 business days · Questions? +1 (814) 514-8158
- Outer Plate
- 14" × 16"
- Duct Opening
- 12" × 14"
- Free Airflow
- 56.3% (94.5 sq in)
- Net Plate Weight
- 4.59 lbs solid
- Min Solid Web
- 1/4" bar
- Laser Tolerance
- ±0.005" kerf