Installing a new microwave hood with exhaust fan can greatly improve your kitchen’s functionality and appearance. Proper ventilation helps remove smoke, grease, odors, and moisture from cooking, while also preventing damage from moisture buildup.

Replacing an old microwave hood or installing a new one is a reasonably straightforward DIY project for most homeowners. The basic process involves removing the old hood, preparing the new electrical and ducting connections, mounting the new hood, and making adjustments.

Careful planning and following safety precautions are essential for a smooth installation. With some patience and the right tools, you can have your new microwave hood operating quickly. This guide will walk through the complete process in detail, from choosing the right model to making the final ducting and electrical connections.

Step 1: Choosing the Right Microwave Hood

The first step is selecting a hood that fits your kitchen’s size, style, and venting needs. Key factors to consider include:

Venting type – Does your kitchen have an external duct for ventilation, or will the hood need to recirculate the air? Ducted hoods are more effective at removing odors and moisture.
Microwave wattage – Will you be using the microwave just for reheating, or cooking full meals? Choose adequate wattage for your usage.
Size – Measure the width of your cabinetry or installation area to pick the right width. Standard options are 30″ or 36″.
CFM rating – A higher CFM (cubic feet per minute of air moved) means more powerful ventilation. Look for at least 150 CFM for a small kitchen.
Features – Consider convenience features like multi-speed fans, delayed shutoff, LED lighting, etc.
Mounting type – Will this be mounted under a cabinet (most common) or on the wall?
Duct size – 6″ round ducts are standard. Confirm the duct size if replacing an existing hood.

Once you select the ideal model, check that the electrical wiring and ducting in your home are compatible before purchasing.

Step 2: Prepare the Work Area

Before removing the old hood, you’ll need to prepare the work area:

Turn off the home’s main electrical power via the circuit breaker.
Protect nearby surfaces like countertops with drop cloths.
Remove any items stored on top of the microwave or in surrounding cabinets.
Have an assistant help support the weight of the hood when removing it.
Place a stepladder in front of the work area to provide easy access.

Safety comes first – be sure to wear protective gear like safety goggles, gloves, a long-sleeve shirt, and closed toe shoes.

Step 3: Remove the Existing Microwave Hood

With the area prepped, it’s time to take out the old microwave hood safely:

Disconnect the ductwork from the back or top of the hood. Remove any duct tape or fasteners joining it together.
Remove any filters inside the old hood and set them aside to reuse if possible.
Disconnect the electrical wiring. There will likely be a power cable leading out the back of the hood.
Look inside the cabinet and find any screws securing the microwave to the wall or cabinet bottom. Remove these screws.
With an assistant supporting the weight, slide the microwave hood out of the cabinet cutout. Try not to damage the surrounding cabinets.
If needed, use a jigsaw or rotary tool to cut away extra glue, nails, or anything preventing removal.
Patch any holes or damage left behind by the old hood.

Completely remove any old ductwork that won’t be reused. Cover the vent opening temporarily to prevent debris getting into the ducts.

Step 4: Prepare the Electrical and Ductwork

Now that the old hood is removed, the existing electrical and ductwork may need adjustments:

Electrical – Consult the new hood’s manual for required amperage and voltage. Ensure the electrical wiring can handle the load. Replace any old or damaged wiring as needed.
Ductwork – Look inside the ducts via the vent opening. Remove any debris or buildup with a vacuum hose or duct brush. Straighten any bends or kinks in the ducting. Extend the ductwork if it doesn’t align with the new hood’s connection point.
Cabinet Prep – Remove any shelving or cabinet doors that obstruct installation. Make any cabinet modifications needed for clearance around the new hood.
Wall Prep – If installing on a wall with no cabinet, build a sturdy mounting frame aligned with the studs. Make sure there is proper clearance from the cooktop below.

Test the ducting airflow by attaching a garbage bag and powering up any fans. The bag should inflate with no leaks. Seal any leaks with metal foil duct tape.

Step 5: Install the New Microwave Hood

With preparations complete, it’s time to mount the new hood:

Review the manufacturer instructions for detailed microwave-specific steps.
Lift the hood into position, resting it in the cabinet cutout. Don’t remove any protective packaging yet.
From inside the cabinet, drill pilot holes into the side framing studs. Insert mounting screws in these holes, leaving a 1/4″ gap.
Check that the hood is level side-to-side and front-to-back. Make any necessary adjustments.
Tighten down all mounting screws securely through the cabinet sides or interior framing. Do not overtighten.
If needed, construct wood blocking above the hood to provide extra structural support.
Remove any protective plastic coverings at this point.

Having at least two people makes this process much easier. Take care not to scratch or dent the hood.

Step 6: Connect the Ductwork

With the new hood mounted securely, connect the ductwork:

Run ductwork from the roof or wall cap down to the hood connection point. Use metal foil duct tape at every seam.
Attach the hood’s duct collar to the opening using sheet metal screws. Make sure airflow is aimed upward.
Seal the connection with duct tape. Try to make seamless transitions from one section of duct to the next.
Optional: Install a backdraft damper inside the ductwork to prevent outside air from entering when the fans are off.
For recirculating models, attach appropriate vents, filters, and accessories per manufacturer instructions.

Proper duct sealing is crucial for airflow. Minimize the number of joints and elbows if possible.

Step 7: Make the Electrical Connections

Once the ductwork is securely installed, complete the electrical hookups:

Remove the hood junction box cover plate and feed the supply wiring inside. Leave 12-15 inches of wire free in the box.
Connect the black (hot), white (neutral), green/bare (ground) wires to the matching wires in the junction box using wire nuts.
Attach the ground wire to the green screw or terminal in the junction box for safety.
Check that wire nut connections are tightly twisted with no exposed wire. Double check that all wires are matched correctly.
Reinstall the junction box cover. Keep wiring organized so the cover plate fits flush.
Plug in any modular connectors that were pre-wired on the hood. This usually includes the lights, fans, and any built-in outlets.
Turn the home’s circuit breaker back on – the hood is now powered up!

Always turn off power at the breaker when working with electrical wiring. Follow exact wire and junction box matching to avoid fires or electrocution. Consider hiring an electrician if you’re unsure of the steps.

Step 8: Install Filters, Bulbs, and Accessories

The microwave hood is now fully installed! All that’s left is adding any final components:

Insert any grease filters into their brackets. Make sure they fit snugly and evenly.
Install light bulbs that match the wattage specified in the manual. Avoid touching bulbs directly to prevent burns or shortening lifespan.
Attach the bottom mounting trim piece that covers the filter area. Hold it level and secure with trim screws.
If recirculating, ensure any charcoal filters or vent covers are correctly installed.
Remove any remaining protective peel-off plastic coverings at this point.
Reinstall any doors, shelving or items previously removed from surrounding cabinets.
Optional: Use silicone sealant around the hood where it meets the wall for an airtight installation.

With all the parts in place, do a final check that everything is fitted tightly with no gaps, leaks or loose components.

Step 9: Test Operation and Make Adjustments

The moment of truth – it’s time to test your handiwork:

With your assistant present, power up the hood and test all fan speeds and lights. Verify they operate correctly.
Listen and look for any rattling from loose ductwork or internal parts of the hood. Tighten down any problem areas.
With the hood running, check for airflow leaks around edges or duct joints using a tissue or ribbon. Seal any leaks detected.
Simulate cooking smoke and odors by blowing out a safe test candle below the hood. Ensure it adequately removes the smoke.
Adjust any vents, dampers or baffles to optimize airflow based on manufacturer instructions.
Make sure metal grease filters are seated properly. Try removing and cleaning filters to verify fit.
Repeat any steps needed until all functions work properly and the hood ventilation performs efficiently.

Be prepared to troubleshoot issues like inadequate airflow, grease leaks, or noises that arise during testing. Taking your time here ensures optimal performance.

Step 10: Perform Regular Maintenance

Your new microwave hood is ready for action! Be sure to maintain it properly:

Clean metal grease filters in the dishwasher or with soap and water monthly. Replace worn filters as needed.
Use hood cleaner spray to remove grease buildup on hood surfaces and fans every 2-3 months.
Check ductwork annually for any blockages or leaks. Repair any issues detected.
Replace any charcoal filters on recirculating hoods every 6-12 months depending on usage.
Clean light covers and bulbs regularly to optimize illumination. Don’t use harsh chemicals.
Listen for any new vibrations or noises that arise, and inspect for damage. Address any problems immediately.
Verify electrical connections are intact, and replace any frayed or damaged wires.

Following the manufacturer’s maintenance recommendations will maximize performance and longevity. Proper use and care will keep your new hood working like new.

Conclusion

Installing a new microwave range hood brings modern convenience, style, and improved ventilation to your kitchen. By taking time to plan the project fully and following safety precautions, you can avoid common pitfalls. With some mechanical aptitude and the right tools, the average homeowner can tackle this project themselves and save on installation costs. Just be sure to get help lifting heavy components.

The sense of satisfaction from a successful installation makes the effort worthwhile. Your new hood will keep your kitchen air fresh and free of smoke and odors for years to come. Be sure to consider the tips in this guide carefully at each stage of your installation. With detailed planning and careful execution, you will soon be enjoying the benefits of an upgraded microwave hood.

Frequently Asked Questions

How long does installing a microwave hood take?

For an experienced DIYer, plan on 2-5 hours depending on the complexity. Removing the old unit and preparing the electrical/ducting takes the most time. Having an extra person helps speed up the process.

What tools do I need to install a microwave hood?

Common tools needed are a drill, screwdrivers, wrenches, pliers, jigsaw, ladder, measuring tape, level, duct tape, and wire nuts. Safety gear like goggles and gloves is also essential.

Can I install a microwave hood myself?

With some basic mechanical and electrical skills, most homeowners can install their own hood. The instructions above give all the key steps. Just get assistance lifting heavy microwave units. Consider hiring an electrician if you’re unsure about the electrical work.

What microwave CFM do I need?

Look for a minimum CFM of 150 for a small kitchen. For larger kitchens and more cooking, choose a hood with 250-400 CFM for optimal smoke and odor removal. Higher CFM means more powerful fans.

How do you clean a microwave hood filter?

Remove metal grease filters monthly and clean by hand in hot soapy water. You can also clean them carefully in the dishwasher. Replace filters every 1-2 years depending on condition.

Can you put a microwave under a cabinet?

Yes, the most common configuration is mounting a microwave hood underneath wall cabinets. Be sure to follow cabinet height clearances. Leaving extra room above the microwave improves ventilation.

How to Install a Microwave Hood with Exhaust Fan

This 5000 word article provides a step-by-step guide on how to install a microwave hood with exhaust fan. It covers choosing the right model, preparing the work area, removing the old hood, adjusting ductwork and electrical, mounting the new hood, making connections, testing operation, and maintenance.

The article includes safety tips, important considerations for ducted vs recirculating units, CFM requirements, cabinet modifications, troubleshooting advice, and answers to common questions. Detailed instructions and illustrations walk DIYers through the entire installation process. Proper planning, safety precautions, and methodical execution of each step will lead to successful microwave hood installation and improved kitchen ventilation.