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Bathroom exhaust duct before ceiling close-up checklist

A pre-cover bathroom ventilation checklist for fan selection, outdoor termination, duct size and material, route, support, insulation, air sealing, backdraft control, electrical coordination, measured airflow planning, and documentation before ceilings and attic access hide the installation.

6 items to check

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Fan model, capacity, sound, controls, and location match the approved design

Critical item

The selected fan should suit room use, duct resistance, control strategy, and local requirements.

The duct terminates outdoors at an approved location

Critical item

Moist air should not discharge into an attic, soffit cavity, crawlspace, wall cavity, or other enclosed area.

Duct size, material, joints, support, and route follow the fan instructions

Critical item

The route should minimize restriction, leakage, sagging, and condensation risk.

Cold-space duct insulation and ceiling air sealing are complete

Critical item

The assembly should limit condensation and uncontrolled air leakage at the fan and penetrations.

Backdraft damper, controls, sensor, and power coordination are ready for testing

Dampers and controls should operate without binding and support the agreed ventilation strategy.

Route, termination, insulation, and future airflow test are documented

The owner should know what is concealed and require final measured or functional verification.

Use after fan housing and exhaust duct are installed but before ceiling close-up or inaccessible attic work. EPA guidance emphasizes that bathroom exhaust must move moisture outdoors, not merely make noise or discharge into an attic. Inspect from the room, accessible framing, and dated stage photographs. Do not energize exposed electrical work, pressure-test systems without authorization, or walk on uncured waterproofing, mortar, or heating assemblies.

Reference standards

  • Approved bathroom plan, adopted state and local code, permit and inspection conditions, authority having jurisdiction requirements, signed scope, and exact plumbing, waterproofing, ventilation, heating, tile, glass, and accessory manufacturer instructions
  • EPA indoor-air guidance requiring bathroom moisture exhaust directly outdoors
  • Fan, duct, termination, damper, insulation, air-sealing, and control instructions

    • Tools

  • Approved plans, fixture and product submittals, permit records, and authorized change orders
  • Tape measure, level, flashlight, camera, and manufacturer-approved test records
  • Dated pre-cover photographs showing every wall, floor, penetration, backing location, and test result

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