How do I mount the HumidiPRO on a return duct?
Choose a location clear of drafts or excessive humidity and avoid mounting near doors, windows, bathrooms, or kitchens. Mark the duct-tube hole inside the duct and drill a 1/2 in (12.7 mm) hole for inserting the duct tube. Secure the wallplate with sheet metal screws provided. Page 4
From the official Honeywell H6062 Humidipro Humidifier manual, page 4
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