tiny banging noise in a vent

tom_77

weil mclain gold series steam boiler with a tankless. the aquastat is set for 160. if the boiler comes on to reach the aquastat limit or if i turn the thermostat on the #35 air vent starts vibrating for about ten minutes or so. ive replaced the vent and not sure what to do now? the boiler was installed about 8 years ago. the air vent is located off of a tee in the return and has a 1/4 (by whatever size the #35 air vent is)90(male by female)!

Steamhead (in transit)

Vent might be too small

how long is the steam main it serves, and what pipe size is it?

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