EXW Singapore — collect or forward from our Singapore office.

3G Electric
REZNOR Blocked Flue Switch, Part #121275 - Replacement HVACR Controls, Switches & Thermostats
REZNORReplacement HVACR Controls, Switches & Thermostats

REZNOR Blocked Flue Switch, Part #121275

REZNOR Replacement HVACR Controls, Switches & Thermostats. Specifications: Product Type: Blocked Flue Switch.

SKU 3G-OTH-99136

Brand
REZNOR
Item
Blocked Flue Switch, Part #121275
Part Number
121275
Category
Replacement HVACR Controls, Switches & Thermostats
Available to Order
Also known as:121275REZNOR
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
EXW Singapore
Collect or forward from our office
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support

Delivery
Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
Payment
Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.

Technical Specifications

REZNOR
Manufacturer Part Number
121275
Product Type
Blocked Flue Switch

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

REZNOR Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

REZNOR Replacement HVACR Controls, Switches & Thermostats. Specifications: Product Type: Blocked Flue Switch.

Frequently Asked Questions

What is a REZNOR blocked flue switch used for?

A REZNOR blocked flue switch is a safety device that shuts down the heater if the flue becomes obstructed, preventing carbon monoxide buildup. It is used in commercial and industrial gas-fired heating systems to protect personnel and equipment from hazardous exhaust conditions.

What are the specifications of the REZNOR blocked flue switch 121275?

The REZNOR blocked flue switch, manufacturer part number 121275, is a replacement HVACR control designed for use in REZNOR heating equipment. It functions as a safety interlock that monitors flue pressure and interrupts burner operation when a blockage is detected.

Where to buy a REZNOR blocked flue switch 121275 worldwide?

3G Electric supplies the REZNOR blocked flue switch 121275 to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for availability and lead time; we source and deliver this genuine REZNOR replacement part globally.

How to install a REZNOR blocked flue switch?

Install the REZNOR blocked flue switch in the flue gas stream per the heater's wiring diagram. Mount it securely, connect the pressure sensing tube, and verify electrical continuity. Always follow the manufacturer's instructions and local codes. Test operation after installation to ensure proper safety shutdown.

Used in

Common applications for REZNOR
Industrial unit heaters — Venter motor and wheel assembly (MPN 220785) for combustion gas exhaust and airflow maintenance.
Commercial rooftop units — Gas valve (MPN 96300) for controlling fuel flow in heating systems.
Make-up air equipment — Pressure switch (MPN 204327) to verify airflow before ignition.
Warehouse heating systems — Fan control (MPN 123976) to regulate airflow in ventilation equipment.
Manufacturing plant heating — Pilot assembly (MPN 125251) for reliable burner ignition.
Reznor HRP400 industrial heaters — OEM blower wheel (MPN 43814) to restore airflow during repairs.
Not sure this is the right part? Photo-identify it→

REZNOR Products

3G Electric supplies REZNOR replacement hvacr controls, switches & thermostats. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

More from REZNOR

View all REZNOR parts →

Customer reviews

No reviews yet — be the first

Questions & answers

No questions yet — ask us the first