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Hole saw for Zehnder tubes

pbout | Posted in Green Building Techniques on

Can anyone recommend a good hole saw for installing Zehnder comfo tubes? One of their installation videos shows a nice (carbon?) hole saw, but I can’t find anything in the appropriate size. 
As for size, they recommend 3″ holes for their 3″ ducts, but their sales rep recommended a 3.25″ size to make pulling easier.
Any feedback from someone who has installed this system would be great.

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Related Questions

Replies

  1. GBA Editor
    Martin Holladay | | #1

    Phil,
    When I Google "3 1/4 inch hole saw," I get all kinds of results. Here are some links:

    Lenox hole saw

    Several options from Home Depot

    Several options from Amazon

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