Resideo FV147A/U MaxiVent™ Air Vent for Heating and Cooling Systems

The FV147A is an automatic air vent from Resideo (Honeywell Home), 1/4 in connection.

An automatic air vent does one job without being asked: it sits at a high point, and when air collects under it a float drops and lets the air out, then rises and reseals as water returns. It is what replaces walking the building with a bleed key every autumn.

Height is everything. A vent below the highest point of the loop vents nothing, because the air is not where the vent is. Put it at the actual top — the crown of the main, the top of the riser, the high side of the air separator.

This one is small and light enough to go on a fitting that would not carry a full-size vent, which is what makes it the answer at the top of a riser or on a coil where there is no room for anything larger.

Rated to 240 F maximum and 150 psi.

• Brand: Resideo (Honeywell Home)
• Manufacturer Part #: FV147A/U
• Type: Automatic air vent
• Connection: Male NPT
• Connection size: 1/4 in
• Material: Brass
• Maximum temperature: 240 F
• Maximum pressure: 150 psi
• Dimensions: 2 in high x 1 5/32 in diameter
• UPC: 085267825986
• Category: Air Vents

Questions about fit or compatibility? Ask our team. We usually reply within one business day.