Broan 637004EX range hood Parts

A ducted (vented) range hood is the best choice for most kitchens because it moves smoke, grease, moisture, and odors out of the home instead of filtering and recirculating them. For the Broan 637004EX, we recommend following the venting and mounting guidance in the 637004EX owner’s manual to get the best capture and performance.

• Ducted (vented) hood: Best overall; exhausts air outdoors through metal ductwork.
• Ductless (recirculating) hood: Best when you cannot run ductwork; relies on filters and needs more frequent maintenance.
• Convertible hood: Best when you want flexibility to vent now or recirculate later (if your hood supports both configurations).
• Wall chimney style: Best for wall ranges; strong capture when sized correctly.
• Island hood: Best for island cooktops; typically needs higher airflow because it is exposed on all sides.

For the best real-world results, focus on these factors:

• Capture area: Choose a hood at least as wide as the cooktop (wider is often better).
• Mounting height: Many hoods perform best when installed about 24 to 30 inches above the cooking surface (the 637004EX manual specifies this range).
• Ducting quality: Use smooth metal duct, keep runs short, and minimize elbows and transitions.
• Blower compatibility: The 637004EX is designed to be used with specific Broan exterior or in-line blowers listed in the manual.
• Noise vs airflow: Higher airflow can mean more noise; good duct design helps reduce both noise and performance loss.

A “best” range hood is the one that actually captures cooking impurities at the source. Correct mounting height, proper ducting, and the right blower setup usually make a bigger difference than extra features.

Last updated: February 2026

On a Broan range hood like model 637004EX, the model number is printed on the specification (rating) label. Check the label on the hood itself (commonly on an inside side wall, near the wiring area, or behind a filter or cover), then match that number when ordering parts or using the 637004EX owner’s manual.

Turn power off at the breaker before opening covers or reaching near wiring.

• Look on the left or right inside wall of the hood canopy.
• Check behind the grease filters (remove filters and look for a label on the metal frame).
• Look near the electrical box area (often close to where the power enters the hood).
• Check the top interior near the duct collar or damper area.
• If your hood has a decorative flue, check inside the lower flue section after removing the filters and looking upward.

Use this checklist so we can match the correct Broan parts and diagrams.

Broan uses model-specific parts lists; even similar-looking range hoods can use different control boards, transformers, or filters. Once you have the model number, you can confidently choose items like the grease filter SB08087141 or the correct control components for 637004EX.

Last updated: February 2026

To remove the fan blade on your Broan 637004EX range hood, shut off power at the breaker, remove the grease filters for access, then remove the retaining clip (or fastener) that locks the blade to the motor shaft and pull the blade straight off. Reinstall in reverse.

• Turn off power at the circuit breaker before opening the hood.
• Let the hood cool completely if it was recently used.
• Wear cut-resistant gloves; sheet metal edges can be sharp.
• Support the blade as you remove the clip so it does not drop.
• Keep screws and clips in a small cup so nothing falls into the blower area.

1. Disconnect power at the main electrical panel.
2. Remove the grease filters: at the handle, push the stop inward and pull the filters downward (this is the standard access step shown in the 637004EX owner's manual).
3. Locate the fan blade and retainer: look at the center hub where the blade mounts to the motor shaft.
4. Remove the retaining clip or fastener:

• If it is a spring-style clip, use needle-nose pliers or a small flat screwdriver to pop it off.
• If it is a nut or set screw, loosen it with the correct driver.

5. Pull the blade straight off the shaft:

• Wiggle gently while pulling.
• If it is stuck from grease buildup, apply a small amount of penetrating oil to the hub (avoid spraying wiring), wait a few minutes, then try again.

6. Clean the shaft and hub before reinstalling.

A fan blade that is not fully seated or not secured by its retaining clip can wobble, make the exhaust fan noisy, and reduce airflow. Removing the filters and cleaning grease buildup also helps the blower pull more air.

Last updated: February 2026

A range hood is made up of the hood body (canopy or cover), grease filtration, a blower system, duct connection parts, and the controls and lighting. On the Broan 637004EX, the parts list also calls out items like the grease filter, duct connector, and control components in the 637004EX manual.

• Hood canopy or hood cover: captures smoke, steam, and grease above the cooktop
• Grease filter: traps grease before air reaches the blower and duct
• Blower or fan system: moves air through the hood and into the ductwork
• Duct connector or duct collar: transitions the hood outlet to the home duct
• Control panel or switch box: fan speed and light controls
• Lights and lamp housings: illuminate the cooking surface

These are real part names you will see for this model when ordering or troubleshooting:

Parts diagrams and lists use specific names to separate similar-looking components (for example, a duct connector vs. a cover). Matching the part name plus the part ID helps you order the correct Broan replacement part the first time.

• Match your hood’s model number: 637004EX
• Compare mounting points, dimensions, and wire connectors
• Use the exploded-view parts list in the 637004EX manual
• For symptom-based troubleshooting steps, use range hood lights and fan don't work

Last updated: February 2026

On the Broan 637004EX range hood, a non-working fan is usually caused by a power problem, a loose blower wiring connection, or a failed control such as the switch box or electronic control board. Start with safe power checks, then inspect wiring and controls.

• Turn off power at the service panel before opening the hood.
• This model has a thermostat that can start the blower automatically.
• Follow access and wiring-box steps in the 637004EX owner’s manual.

• Reset the breaker and any GFCI outlet feeding the hood.
• Remove and clean the grease filter; heavy buildup can make the fan seem “not working.”
• Check the blower wheel area for grease or debris that prevents rotation.
• Open the wiring box and confirm wires are not pinched under the cover.
• If lights work but the fan does not, focus on the fan control circuit (switches or board).

The 637004EX is designed to work with specific Broan exterior or in-line blowers; a mismatched blower can cause a no-run condition. Also verify the blower connection wiring matches the manual (white-to-white, red-to-black, green-to-ground).

• Switch box assembly SB06108077 (fan switching and speed control)
• Range hood electronic control board SB08086668 (electronic control issues)
• Ht sentry SB02300787 (heat-sensing control that can affect blower operation)

A dead or weak hood fan leaves smoke, heat, and grease in the kitchen and can increase grease buildup inside the hood and ductwork.

Last updated: February 2026