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  • #16

    Re: kITCHEN EXHAUST FAN

    Originally posted by Wally in Calgary View Post

    Peter -- THIS is what I usually use.
    Thanks, Wally, looks like it will do the job.
    The difference between a master and a beginner: The master has failed more times than the beginner has even tried.

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    • #17

      Re: kITCHEN EXHAUST FAN

      Aw, shucks. I guess I shouldn't post our Econo method .

      https://www.uline.com/BL_3654/White-...+mailing+tubes
      Start slow and wind down gracefully

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      • #18

        Re: kITCHEN EXHAUST FAN

        Originally posted by Woodwreck View Post
        Aw, shucks. I guess I shouldn't post our Econo method .

        https://www.uline.com/BL_3654/White-...+mailing+tubes
        4" is not large enough for the exhaust fans of the present.

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        • #19

          Re: kITCHEN EXHAUST FAN

          how long is this 4 inch vent pipe with the 2 45 degree bends? If there is too much resistance you may not get much exhaust at all. keep in mind the rating is like with no pipe. a 300 cfpm needs more than a 4 inch pipe. minimum 6 inch https://inspectapedia.com/ventilatio...ct_Lengths.php
          smallerstick likes this.

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          • #20

            Re: kITCHEN EXHAUST FAN

            Range hood fans are only used sporadically and insulation issues are not the major concern.

            Kitchen exhaust fans for one's cook-top have more a concern of grease build up than condensation issues. Yes, we have screens on our over-the-top range hood covers, but they often get removed and forgotten about and considerations for certain standards in such situations are what end up being the most considered factor.

            Having 45s and such is, especially mulitple ones are another issue that are likely nonos that should be avoided. Having soffit out vents is a nono in my mind. Having any intricate rooftop cap can be, but not a deal breaker necessarily.

            Why not ask an HVAC/Ducting Pipe local supplier this? Or even pickin the brains of a local kitchen install company itself. You'd be surprised on how you can get this info off them if talking to the right person in places like this using the right approach.
            Kevin

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            • #21

              Re: kITCHEN EXHAUST FAN

              Here in Ontario the building code does not allow flexible pipe for kitchen stove fans. Has to be insulated smooth wall pipe. If not being inspected it is not an issue. I believe the max for a 4 inch pipe is 110 cfm
              Last edited by Brian @ Muir; 05-12-2020, 10:21 PM.
              smallerstick likes this.
              If your dreams don't scare you, you are not dreaming big enough

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              • #22

                Re: kITCHEN EXHAUST FAN

                Originally posted by Brian @ Muir View Post
                Here in Ontario the building code does not allow flexible pipe for kitchen stove fans. Has to be insulated smooth wall pipe. If not being inspected it is not an issue. I believe the max for a 4 inch pipe is 110 cfm
                Good point/reminder Brian. I wasn't even thinking anybody would use a flex for that.

                I wouldn't even use a flex/accordion vent for my clothes drier. Solid wall vents except for gas emanating from your trousers is the way to go!
                Kevin

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                • #23

                  Re: kITCHEN EXHAUST FAN

                  About half of my installs are in new construction and over the last few years building inspectors are paying a lot of attention to clearances in the area of the stove. Something to be aware of is clearances of cabinets above the stove. The OBC states that you require 750 mm clearance above burner for combustible cabinets. The exception is if the stove manufacture requires otherwise. The job I have on the go now and the client has a 36 inch gas range, 6 burner. The stove manufacture specifies you must have 41 inch clearance between stove and cabinets. I ordered a hood fan that has a remote unit. It is not your typical $150 hood fan.

                  Brian
                  If your dreams don't scare you, you are not dreaming big enough

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                  • #24

                    Re: kITCHEN EXHAUST FAN

                    Where I was working last year there were a lot of homes where the appliances specified 10 inch, 8 inch, or 6 inch + 8 inch diameter kitchen exhaust. Towards the end of the job the HVAC inspector was rejecting them because of inadequate make up air.

                    Could be a trend forming, I don't know.

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                    • #25

                      Re: kITCHEN EXHAUST FAN

                      It is something that I caution people about all the time. They are very aware of it in the US. BROAN manufacture a $200 makeup air unit. It automatically activates when a vacuum is created. It is best to locate near the stove as it brings air from outside and of course cold air in winter. I was once told by a local HVAC guy locally that anything over 350 cfm requires a make up unit. I have never seen that enforced in any of my installs. Luckily it is the HVAC guys problem not mine.
                      If your dreams don't scare you, you are not dreaming big enough

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