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Creating negative pressure in flue?

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Creating negative pressure in flue?

Home › Forums › General Questions › Creating negative pressure in flue?

Viewing 6 posts - 1 through 6 (of 6 total)
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  • 21 September 2020 at 13:36 #497043
    Peter Bell
    Participant
      @peterbell11509

      I have a vehicle type Webasto diesel heater which really does not like operating on a 3" dia vertical flue due to back pressure. I had thought of making a steam raising type blower with a variable speed 12v motor to put on top of the flue as an experiment. to create a slight negative pressure but have no experiance of these.

      However on the steam raising designs looked at all the flu gas passes through the fan, is this decremental on the fan? Was going to put the motor on top

      Are there are any alternative designs around using an ejector or similar which means the fan is on the clean cool bit just supplying air?

      Can anyone offer any advice before I start? Thanks

      Peter

      Edited By Peter Bell on 21/09/2020 13:37:46

      Edited By Peter Bell on 21/09/2020 13:38:37

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      21 September 2020 at 13:36 #27641
      Peter Bell
      Participant
        @peterbell11509
        21 September 2020 at 15:48 #497064
        Dave Halford
        Participant
          @davehalford22513

          Have you considered the carbon monoxide might get you if you do it wrong.

          21 September 2020 at 17:12 #497076
          Robert Atkinson 2
          Participant
            @robertatkinson2

            I concur with Dave.

            Put the heater outside and run the hot water inside. If it's an air heater stll put it outside but get a carbon monoxide alarm as well. A relative of mine died from CO due to a modification to a heater. Not the way I wanted to inherit his watch making tools.

            Robert G8RPI.

            21 September 2020 at 18:11 #497085
            Clive Brown 1
            Participant
              @clivebrown1
              Posted by Peter Bell on 21/09/2020 13:36:22:

              I have a vehicle type Webasto diesel heater which really does not like operating on a 3" dia vertical flue due to back pressure..

              Peter

              Are you sure that you've diagnosed the problem correctly? Don't Webastos on vehicles and boats normally operate with fairly lengthy exhausts much less than 3" dia?

              21 September 2020 at 18:18 #497088
              Peter Bell
              Participant
                @peterbell11509

                Thanks everyone for your help.  Perhaps I should have said it was on a test rig outside but I didnt think I needed to to ask about a fan!   Peter

                 

                Edited By Peter Bell on 21/09/2020 18:35:22

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