7/8in Quick Patch for Corner Pulley Quick Seal #430 - #1476
The Evergreen 1476 Quick-Patch is the definitive mechanical solution for sealing the 7/8" (22.2 mm) holes left by legacy 430 Quick Seal adapters in commercial exhaust hoods. Under NFPA 96, every hood penetration must be liquid-tight to prevent flammable grease runoff from migrating into wall cavities. The 1476 restores this liquid-tight envelope using a nickel chrome plated carbon steel body and a high-temperature gasket, without requiring welding or specialized tools.
For fire safety contractors and facility managers, the 1476 is an essential inventory item for system overhauls. A single technician can certify a hood as code-compliant in minutes using basic hand tools, eliminating the downtime and permitting requirements of in-field hot-work welding. The nickel chrome plating provides an aesthetic match for professional hardware while offering a sacrificial corrosion-resistant layer that protects against caustic cleaning agents over a 10-year service life. Available individually (P/N 1476) or in a 24-pack (P/N 1488).
Compression Seal Design
When the nut is tightened, compressive force is distributed evenly across the high-temperature gasket's surface area, creating a pressure barrier that exceeds the internal pressure of the exhaust duct. The gasket material is engineered with an expansion coefficient matched to standard steel, ensuring the seal does not weep or migrate as the hood undergoes thermal cycling during service.
| Feature | Details |
|---|---|
| Manufacturer | Evergreen Fire Protection |
| Part Number | 1476 (single) / 1488 (24-pack) |
| Hole Size | 7/8" (22.2 mm) |
| Compatibility | Replaces 430 Quick Seal adapters |
| Material | Nickel chrome plated carbon steel |
| Seal Type | High-temperature gasket |
| Compliance | NFPA 96, NFPA 17, NFPA 17A |
Surface Preparation
Thoroughly degrease the area around the 7/8" hole before installation. Any residual carbonized grease will create a micro-wedge between the gasket and the hood surface, allowing liquid to migrate past the seal and creating a compliance deficiency.
The One-Inch Rule
Verify that the hood wall thickness is within the calibrated thread range of the 1476. For double-wall hood models, confirm the patch threads reach through both layers before tightening the nut to ensure a secure mechanical connection.
Torque and Seal Verification
Tighten to hand-tight plus a quarter turn. The primary indicator of a correct installation is a visible slight bulge of the gasket beyond the edge of the cap. This compression confirms a liquid-tight seal and is the standard check during a Fire Marshal or AHJ walkthrough.
No Hot-Work Permit Required
The 1476 is a cold-fix that satisfies NFPA 96 liquid-tight penetration requirements without open-arc welding. This is particularly valuable in occupied facilities and mall-based kitchens where hot-work permits are difficult or time-consuming to obtain.
Is this patch compatible with all corner pulley holes?
The 1476 is specifically sized for the 7/8" holes left by 430 Quick Seal adapters. For 15/16" pulley holes, the 1478 model must be used instead. Using a 1476 in a larger hole will produce an off-center seal that will eventually leak and fail inspection.
Does the quick patch require specialized tools?
No. The 1476 is a mechanical fitting secured with a standard lock washer and nut. A liquid-tight seal can be achieved in minutes using basic hand tools, with no welding equipment or special training required.
Is the gasket rated for high temperatures?
Yes. The gasket is made of a pliable high-temperature material designed to maintain its seal under the intense thermal conditions of an exhaust duct, preventing liquid grease migration through the hood wall in support of both fire safety and sanitation compliance.
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