Need 9" Hole Saw

Discussion in 'HVAC Heating & Cooling' started by inertiacoupling, Jun 17, 2009.

  1. inertiacoupling

    inertiacoupling Member

    Oct 26, 2007
    Fishers, IN
    I have a house that has hand plastered walls that use a light metal mesh under the plaster.

    I'm having central air put in, and my HVAC man says I can help make his job easier if I put in the 9" holes for the ducts and returns in the ceiling.

    Does anybody know where I can get a 9" hole saw, or of an efficient way to make these holes?
    Thanks for any advice
  2. FloridaOrange

    FloridaOrange Plumbing Designer

    Dec 2, 2005
    Plumbing Designer
    SW Florida
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  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    The metal lath will be a and nasty stuff. I've used a Rotozip to cut large round holes. None of the bits available for it would last long going through the lath. But, if you set the depth to cut through the plaster, it would give you a nice template to cut the lath, maybe with a metal cutting blad on a jigsaw or a good pair of tinsnips or aviation cutters.

    This might work. I might also catch and make a mess! The biggest traditional hole saw I found was 6".
  5. jimbo

    jimbo Plumber

    Aug 31, 2004
    San Diego, CA
    Plaster tears up the teeth on any saw blade you use. Buy several!
  6. geno54

    geno54 New Member

    Jan 4, 2008
    The reason he said that is because cutting plaster with either wood lathe or metal grid is that is tedious and time consuming to perform. Chips are common and ceilings sometimes have to be repatched and or painted afterwards if not done carefully. No 9 inch hole saws I know of.
  7. brownizs

    brownizs In the Trades

    Feb 9, 2006
    Springfield, IL
    Actually, there is a tool that is used with a Rotozip to cut a hole up to 12-14". It sits in a hole that you drill, then from there, the Roto sits on the outside edge. You do need to use a Carbide tip cutter.
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