FREE HERS Rater PRACTICE EXAM |
Your Online HERS Rater Training CenterCAZ Depressurization LimitsWhat is an orphan natural draft water heater?
Orphan natural draft water heater (including outside chimneys)BPI Standard of -2 Pa limit, if more negative CAZ fails
Natural draft boiler or furnace commonly vented with water heaterBPI Standard of -3 Pa limit, if more negative CAZ fails
Remember, a natural draft furnace is going to be old and have NO draft fan in the AHU cabinet. Natural draft boiler or furnace with vent damper commonly vented with
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