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Field Controls 7MG1 barometric draft control, metal housing, round damper, weight adjustment visible

Field Controls

Field Controls 01804401 7MG1 Barometric Draft Control

SKU CH-G4CM-0CBST

Regulates draft in gas-fired furnaces and boilers with double-acting pressure relief from 0.01 in. w.c. and adjustable control up to 0.1 in. w.c

  • Double-acting design relieves positive vent pressures as low as .01
  • Precise draft adjustment from .01" to .1" using weights
  • Improves combustion stability on gas atmospheric installations with venting problems
  • Suitable where a draft hood cannot be installed on gas appliances
  • Widely used for conversion burner installations and sidewall power venters

7MG1 Barometric Draft Control

The Field Controls 01804401 7MG1 is a double-acting barometric draft control built for gas-fired furnaces and boilers. It suits conversion burner installations, mechanical draft inducers, sidewall power venters and atmospheric appliances where a draft hood cannot be fitted. The device maintains precise draft levels from .01" to .1" using adjustable weights. It also relieves positive vent pressures as low as .01" to improve combustion stability.

Installation and common issues

Mount the control in the vent connector with the hinge horizontal so the gate swings freely. Level the body and set the counterweight to the draft pressure the appliance manufacturer specifies. The most frequent problems are binding hinges from debris, an unlevel mount that skews the gate, and a weight setting that does not match the required draft range. Verify free movement after the first firing cycle.

Pre-order checks

Confirm the vent connector accepts a 7 inch diameter control and that the appliance burns gas. Ensure the installation location allows the double-acting gate to open both inward and outward without obstruction. Check that the system design calls for draft regulation between .01" and .1" and that positive pressure relief down to .01" is required. Verify local codes permit this control type on the specific appliance.

Highlights

  • Double-acting design relieves positive vent pressures as low as .01
  • Precise draft adjustment from .01" to .1" using weights
  • Improves combustion stability on gas atmospheric installations with venting problems
  • Suitable where a draft hood cannot be installed on gas appliances
  • Widely used for conversion burner installations and sidewall power venters

Specifications

BrandField controls

Questions about this item

How can I verify the 7MG1 is regulating draft correctly after installation?

Observe the damper movement; it should open outward to relieve positive vent pressure as low as .01" and adjust smoothly with the weight settings between .01" and .1".

What components are included with the 01804401 and what must be purchased separately?

The package contains the 7" MG1 barometric draft control unit; vent pipe, fittings, and mounting hardware are not included and must be sourced separately.

Which version of the MG1 should I select for a standard gas furnace installation?

Choose the 7MG1 model when a 7-inch connection matches the appliance vent size specified by the manufacturer.

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