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Steam Vents
Auto Vent 670Auto Vent 675

JacobusŪ Steam Vents

Maid-O'-MistŪ/JacobusŪ Steam Vents - Models D, C, 6, 5 & 4
Models D, C, 6, 5 & 4



Maid-O'-MistŪ/JacobusŪ Steam Vents - 1/4 Inch Straight
1/4 Inch Straight



Maid-O'-MistŪ/JacobusŪ Steam Vents - 1/8 Inch Angle
1/8 Inch Angle



Maid-O'-MistŪ/JacobusŪ Steam Vents - 1/8 Inch Straight
1/8 Inch Straight



Maid-O'-MistŪ/JacobusŪ Steam Vents - Model 1
Model 1
A vent port size for every room, from the largest size for the coldest rooms to the smallest size for the "too hot" rooms.. Easy to install on any radiator.

ONLY these Maid-O'-MistŪ/JacobusŪ steam valves give you ALL these benefits!
  • 16 Different Models
  • Self-Adjusting Thermostatic Control
  • Float to Prevent Water Escape
  • Reduces Radiator Noise
  • Cuts Fuel Consumption
  • Assures Even Heat Distribution
  • Lowers Operating Costs
MODEL TYPE PIPE SIZE VENT SIZE DESCRIPTION
4 Angle
Straight
Straight
1/8"
1/8"
1/4"
.040"
.040"
.040"
For radiators in room in which the thermostat is located; or where radiators affect operation of thermostat.
5 Angle
Straight
Straight
1/8"
1/8"
1/4"
.070"
.070"
.070"
Venting capacity equal to 4. ordinary air valves. Use on radiators near boiler and in warm rooms (second-floor radiators, for example).
6 Angle
Straight
Straight
1/8"
1/8"
1/4"
.0935"
.0935"
.0935"
Venting capacity equal to 8 ordinary air valves. Use on radiators farther ,from boiler and in cold rooms.
C Angle
Straight
Straight
1/8"
1/8"
1/4"
.1285"
.1285"
.1285"
Venting capacity equal to 15 ordinary air valves. Use on radiators farthest from boiler and in coldest rooms (for example, on third floor radiators and above).
D Angle
Straight
Straight
1/8"
1/8"
1/4"
.1850"
.1850"
.1850"
Venting Capacity equal to 27 ordinary air valves. Use when large amount of air must be vented such as on radiators with particularly long branches and on very large radiators.
1 Straight Main Vent 1/2" x 3/4" .1850" Designed to vent the air from the main lines, as well as on longer runs (depending on the size of the building). Has 1/2" x 3/4" combination vertical connection. Use one or more at the end of the short main, or the, main running to the warm side of the building. Also use two or three at the end of the long main, or the main running to the cold side of the building.

Maid-O'-MistŪ/JacobusŪ Steam Vents - There's a Vent Port Size for Every Room
There's a Vent Port Size for Every Room
Maid-O'-MistŪ/JacobusŪ Steam Vents - Improved Nickel-Plated Brass Body - Improved Valve Seat - Improved Solid Float - Improved Bi-Metal Thermostatic Element
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