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    skelley's Avatar
    skelley Posts: 1, Reputation: 1
    New Member

    Sep 30, 2009, 12:21 PM
    How do I measure inches of water column ?
    How do I measure inches of water column in a exhaust for a reflow oven ?
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member

    Sep 30, 2009, 05:47 PM

    Do you mean static pressure?

    The first two links give you the procedure:


    Here is a particular probe and an optional "surge damper" device

    In a round duct what you will find is that usually near the center the flow is more laminar, stable and near a maximum. Near the edges, you get more of a turbulent flow.

    You need to be at least a duct diameter away from say the exit and another duct diameter before it hits the fan.

    If your going to be doing this as part of a routine inspection consider installing ports and use a differential pressure sensor.

    W.C. is yet another unit like PSI

    Example: Digital Manometer, Dual Input -TPI 621 - Mfg# 621

    A differential manometer may be more useful. For single ended use, leave one port open to atmosphere.

    Dwyer Engineering is a major manufacturer of air velocity and pressure equipment.

    I hope I helped.

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