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  1. KYOnscuffle

    Balanced external static pressure question

    I have a 3 ton package heat pump system and have a question about External Static Pressure. The system list a max ESP 0.5 iwc. My measured ESP is .42 iwc, which includes 0.25 of the return filter. The thing I'm finding strange is the entire ESP is in the return duct, with the supply duct barely...

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