Description
The Tjernlund Products DC4 is a 4″ Single Acting Draft Control designed to regulate and stabilize flue draft in residential and light commercial heating systems. By automatically relieving excess negative draft, the DC4 helps ensure consistent combustion performance, improved fuel efficiency, and safe appliance operation.
Product Overview
Draft controls are essential components in oil and gas-fired heating systems. The DC4 mounts directly into the flue pipe and operates mechanically — no electricity required — making it a reliable, low-maintenance solution for maintaining the correct draft level at the appliance.
Key Features
- 4″ single acting draft control for flue pipe installation
- Mechanically operated — no electrical connection required
- Automatically relieves excess negative draft to maintain stable combustion
- Helps improve fuel efficiency and reduce appliance wear
- Compatible with oil and gas-fired furnaces, boilers, and water heaters
- Durable construction for long-term flue system performance
- Designed for easy installation into standard 4″ flue pipe
Applications
- Residential oil and gas-fired furnaces
- Hot water boilers
- Domestic water heaters
- Light commercial heating appliances with 4″ flue connections
Why Choose Tjernlund
Tjernlund Products is a trusted name in combustion air and venting solutions, with decades of experience engineering products that support safe and efficient heating system operation. The DC4 reflects that commitment to quality and reliability.







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