1. Product Overview
The COSMO COS-5MU36 is a 36-inch under cabinet range hood from the Delta Collection, designed for efficient ventilation in your kitchen. It features a brushed stainless steel finish, push-button controls, and LED lighting.

Image 1.1: Front view of the COSMO COS-5MU36 range hood.
Key features include:
- Slim Space-Saving Design: Ideal for under cabinet installation in various kitchen sizes.
- Efficient and Quiet Operation: A 3-speed motor with a low noise level of 50 dB on the lowest setting.
- User-Friendly Controls: Push-button panel for fan speed, lights, and power.
- Superior Multi-Layer Filtration: Durable, reusable aluminum mesh filters for trapping grease and oil.
- Versatile Ventilation: Convertible between ducted and ductless operation (Carbon Filter Kit CFK4 sold separately for ductless conversion).
- Integrated LED Lighting: Provides clear illumination for your cooking area.
2. Safety Information
To reduce the risk of fire, electric shock, or injury, observe the following:
- Install this range hood in accordance with all national and local codes and ordinances.
- Always disconnect power at the service panel before servicing or cleaning the unit.
- Ensure proper ventilation. This unit is designed for general ventilating use only. Do not use to exhaust hazardous or explosive materials and vapors.
- Clean grease filters frequently. Grease should not be allowed to accumulate on the fan or filters.
- Never leave surface units unattended at high settings. Boil-overs cause smoking and greasy spill-overs that may ignite.
- Use proper pan size. Always use cookware appropriate for the size of the surface element.
- If a fire occurs, turn off the range hood and then extinguish flames using a dry chemical extinguisher or a CO2 extinguisher. Never use water on a grease fire.
3. Setup and Installation
The COSMO COS-5MU36 range hood can be installed as either a ducted or ductless system. For ductless conversion, a Carbon Filter Kit (Part # CFK4) is required and sold separately.
3.1 Included Components
Your package includes:
- Multi-layer Mesh Filters
- Backdraft Damper
- LED Light Bulbs (pre-installed)
- Mounting Kit
- Instruction Manual

Image 3.1: Included components for the range hood.
3.2 Dimensions and Venting Options
Ensure adequate space for installation. The range hood dimensions are 35.25" (W) x 19.75" (L) x 5.5" (H). It supports top or back venting. A 5" round duct is recommended for ducted installations.

Image 3.2: Detailed dimensions and top/rear vent options.
3.3 Ductless Conversion Steps
To convert your range hood to ductless operation (recirculating air), you will need the Carbon Filter Kit Part # CFK4 (sold separately). Follow these steps:
- Open the unit by removing the mesh filters and locate the switch in the middle of the fan unit. Remove the bolt with a Phillips tool.
- Change the switch to the ductless position, which allows the exhaust to flow out of the front vent. Replace the bolt with a Phillips tool.
- Place the charcoal filter on top of the middle piece and tighten it into place. Replace mesh filters.

Image 3.3: Visual guide for ductless conversion.
3.4 Installation Video Guide
For a visual guide on the installation process, please refer to the official quick start video:
Video 3.4: Official Quick Start Guide for COSMO Under Cabinet Range Hood 5MU Series. This video provides an overview of the installation process.
4. Operating Instructions
The range hood is equipped with push-button controls for easy operation of its functions.
4.1 Control Panel
The control panel features buttons for power, fan speed selection, and lighting.

Image 4.1: Push-button controls for fan speeds and lights.
- Power Button: Turns the unit on or off.
- Fan Speed Buttons: Select from three fan speeds (Low, Medium, High) to adjust airflow based on cooking needs. The fan operates quietly, with a noise level as low as 50 dB on the lowest speed.
- Light Button: Controls the built-in LED lights to illuminate your cooking surface.
5. Maintenance
Regular maintenance ensures optimal performance and longevity of your range hood.
5.1 Cleaning Mesh Filters
The multi-layer aluminum mesh filters are designed to trap grease and oil effectively. They are reusable and can be cleaned by hand or in a dishwasher.

Image 5.1: Aluminum mesh filters.
To clean:
- Unclip and remove the mesh filters from the underside of the hood.
- Wash the filters in warm, soapy water or place them in a dishwasher.
- Allow filters to dry completely before re-installing.
5.2 Replacing Carbon Filters (Ductless Mode)
If operating in ductless mode, the carbon filters (Part # CFK4) should be replaced periodically, typically every 3-6 months depending on usage, to maintain effective odor removal.
6. Troubleshooting
Refer to this section for solutions to common issues.
| Problem | Possible Cause | Solution |
|---|---|---|
| Fan does not operate | No power supply; Motor failure; Control panel issue | Check power connection and circuit breaker. Contact customer support if motor or control panel is faulty. |
| Lights do not work | Light bulb failure; Wiring issue | Replace LED light bulbs. Check wiring connections. |
| Insufficient suction | Clogged filters; Improper ducting; Obstruction in airflow | Clean or replace filters. Check ductwork for proper installation and obstructions. Ensure backdraft damper is opening correctly. |
| Excessive noise | Loose parts; Motor imbalance; Improper installation | Check for loose screws or components. Ensure proper installation and secure mounting. Contact customer support if motor is noisy. |
7. Specifications
| Feature | Detail |
|---|---|
| Brand | COSMO |
| Model Info | COS-5MU36 |
| Product Dimensions | 19.75"D x 35.25"W x 5.5"H |
| Item Weight | 15 Pounds |
| Material | Stainless Steel |
| Air Flow Capacity | 200 Cubic Feet Per Minute |
| Noise Level | 50 Decibels (lowest speed) |
| Number of Speeds | 3 |
| Controls Type | Push Button Controls |
| Light Source Type | LED |
| Voltage | 120 Volts |
| Wattage | 146 watts |
| Filter Type | Mesh (Reusable) |
| Ventilation Type | Ducted/Ductless Convertible |
| Duct Size | 5" Round |
| Installation Type | Under Cabinet Mount |
| UPC | 854115007382 |
8. Warranty and Support
Your COSMO COS-5MU36 range hood comes with a 2-Year Limited Parts Warranty. For warranty claims, technical assistance, or general inquiries, please contact our USA-based customer support team.
Please refer to the contact information provided in your product packaging or visit the official COSMO website for the most up-to-date support details.





