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Silver galvanized steel barometric draft control unit

Field Controls

Field Controls 8MG1 Barometric Draft Control HVAC Control 1986501

SKU CH-QRTB-ZT4RF

Double-acting barometric draft control for gas furnaces and boilers, adjustable from .01" to .1" with galvanized steel construction

  • Product colorSilver
  • Double-acting design relieves positive vent pressure down to .01
  • Precise draft adjustment from .01" to .1" using weights
  • Improves combustion stability on gas atmospheric appliances
  • Suitable where a draft hood cannot be installed
  • Galvanised steel construction in silver finish

Product identity

The Field Controls 8MG1 is a barometric draft control built for gas-fired furnaces and boilers. It serves conversion burner installations, mechanical draft inducers and sidewall power venters where a draft hood cannot be fitted.

Adjustment limits

The double-acting mechanism opens outward to relieve positive vent pressures as low as 0.01 inches water column. Draft can be set accurately with weights from 0.01 to 0.1 inches water column for precise combustion stability.

Installation checks

Verify the vent connector diameter matches the 8 inch size and that the appliance operates on gas fuel. Confirm the venting layout allows the control to relieve positive pressure and that local codes permit a barometric device in place of a draft hood.

How it compares

Measured against everything we stock in Heating & Cooling Controllers, at today’s prices. Recalculated every night.

Price $155.99
Pricier than about 77% of the 1,762 comparable items (median $45.99).

Specifications

Product
Brand nameField controls
Product colorSilver

Questions about this item

How do I pick the right version for my system?

Choose the 8MG1 model when your vent diameter is 7 to 8 inches and you need a double-acting control for gas-fired furnaces, boilers, conversion burners, or mechanical draft inducers.

What does the 50.3 N capacity mean once installed?

It indicates the control handles a specific draft force range, allowing precise weight adjustments from .01" to .1" to stabilise combustion and relieve positive vent pressures as low as .01".

What interface does it use and what does that cap in practice?

It connects directly into the venting system without a draft hood, capping the maximum draft level at the weight setting you select between .01" and .1" for accurate gas-appliance control.

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