OEM replacement pressure switch for Lennox, Armstrong, and Ducane gas furnaces. Factory-calibrated to 1.41" WC, this SPST switch proves inducer motor operation before allowing ignition, preventing unsafe operation from blocked vents or inducer failure. Dual 1/4" barb connections for accurate differential pressure monitoring.
Lennox 57M66 Pressure Switch 1.41" WC SPST
Lennox
$74.95
In Stock
- OEM / cross-reference
- Lennox 57M6601, Honeywell IS22141081S5082
- Replaces
- Lennox 12W50, Lennox R20293415, Lennox 57M6601
- Fits brands
- Lennox, Armstrong, Ducane, Allied, Concord, Magic Chef, Magic-Pak
- SKU:
- 57M66
- Product Type:
- Pressure Switch
- Subcategory:
- Combustion Air Proving
- Application:
- Residential
- System Type:
- Furnace, Air Handler
- Installation Type:
- OEM Replacement
- Pressure Rating:
- 1.41" WC
- Fuel Type:
- Natural Gas
- Inlet Size:
- 1/4" Barb
- Connection Type:
- Barb
- Switch Action:
- SPST-NO
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