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air eliminator sizing

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STEAM DOCTOR
STEAM DOCTOR Member Posts: 2,511
in THE MAIN WALL
Good evening. I have a customer who has a 40k  BTU hot water boiler with no air eliminator. The main is 1 1/4" and there is a single 3/4" loop. When  I add the air eliminator does it need to go on the main or can it go on the 3/4" pipe? The reason why I'm asking is because the 3/4'" line is copper and easier to tap into. Also all of the accessible pipes are vertical and from what i found on pexsupply.com it seems that the only vertical spirovents are smaller then 1 1/4". 
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