If you are fitting a 30-inch electric or induction cooktop into a condo or small apartment kitchen where installation flexibility is limited, the Cosmo COS-5MU30 handles light-duty ventilation in that configuration without demanding a complicated installation. Its rated 200 CFM output is adequate for low-to-medium heat cooking on electric burners drawing under 5,000 watts total.
However, 200 CFM measures below ASHRAE’s 250 CFM minimum recommendation for a 30-inch cooktop, and real-world delivery through a standard residential duct run drops that figure to roughly 140 to 150 CFM. For any kitchen with a gas range producing more than 30,000 BTU in aggregate, this hood’s extraction capacity falls short of the ventilation load.
In This Article
Who This Hood Is For
This hood matches a 30-inch electric or induction cooktop in a kitchen with existing 5-inch duct access at the rear or top. It suits everyday cooking at low to medium heat: simmering, sauteing, and reheating. If your cooktop is gas with combined output above 30,000 BTU, this hood does not meet the ventilation load. You should rule out the COS-5MU30 at the start of your search if you cook regularly on high heat or use any individual burner above 15,000 BTU.
Cosmo 5MU30 Specifications
Specification | Detail |
CFM | 200 CFM (manufacturer-rated; not HVI-certified) |
Noise Levels | Low: ~1–1.5 sones (50 dB); High: ~2–3 sones |
Filter Type | Two aluminum mesh filters; dishwasher-safe |
Duct size | 5-inch round |
Dimensions | 29.75″ W x 19.75″ D x 5.5″ H |
Convertible to ductless | Yes, with CFK4 carbon filter kit (sold separately) |
Electrical | 120V/60Hz, 79W motor input, 3-prong plug included |
Construction | 430-grade stainless steel, 20-gauge |
Certification | ETL listed (safety standard; not an airflow certification) |
Warranty | 2-year limited parts |
Performance: What 200 CFM Actually Delivers
The 200 CFM rated figure requires context. ASHRAE’s residential ventilation guideline sets a minimum of 100 CFM per linear foot of cooktop, placing the floor for a 30-inch range at 250 CFM. The Cosmo Cos 5mu30 arrives 50 CFM below that benchmark before installation resistance is applied.
A standard duct run with a 5-inch round duct, two 90-degree elbows, and 8 feet of straight run reduces effective airflow by 25 to 30 percent due to static pressure losses. That drops delivered output to roughly 140 to 150 CFM at the discharge point. On an electric cooktop drawing under 6,000 watts total, this is workable for everyday low-to-medium heat cooking. At high heat, steam and light smoke will escape capture at the hood’s edges.
At low speed, the hood operates at 50 dB, quiet enough for normal conversation in an open kitchen. At maximum speed, it reaches 56 dB, acceptable in most enclosed kitchens. Cosmo publishes these figures in decibels, not sones. The 50 dB low-speed reading corresponds to roughly 1 to 1.5 sones under typical conditions; the 56 dB high-speed figure translates to approximately 2 to 3 sones. The three-speed fan allows you to match extraction intensity to cooking load, though the ceiling remains 200 CFM regardless of setting.
Slim, Space-Saving Stainless Build Quality
The body is 430-grade stainless steel at 20-gauge thickness, which is standard for this segment. It is magnetic and carries less corrosion resistance than the 304-grade steel used in higher-tier hoods, though it performs adequately in a typical kitchen environment. The 5.5-inch profile is genuinely slim, useful in tight under-cabinet configurations common in condos and older kitchens built before standard upper cabinet depth increased.
The five-button push panel controls power, three fan speeds, and lighting. Each button is clearly labeled and requires no adjustment period. There is no delay-off timer, auto-off feature, or variable speed slider; those are standard inclusions on hoods positioned a step above this model in the market.
Dishwasher-Safe Filters with Easy Removal
The two aluminum mesh filters are dishwasher-safe and require no tools for removal. For moderate cooking frequency, placing them in the dishwasher monthly is sufficient to prevent grease buildup from restricting airflow. This matters more on a 200 CFM hood than on higher-capacity models because filter restriction has a proportionally larger impact when baseline output is already low.
In ductless mode, the CFK4 carbon filter requires replacement every six months under normal use. The kit is sold separately. At one replacement per six months, the ongoing cost is predictable and consistent year to year, though the interval shortens with heavier cooking frequency.
Dual Venting with Flexible Installation
The hood requires a 5-inch round duct and a standard 120V/60Hz, 3-prong outlet within reach of the supply cord. Mounting height must be between 24 and 36 inches above the cooktop. The 5.5-inch profile accommodates cabinets with limited vertical clearance, which helps where standard-depth hoods cannot fit.
Top and rear venting are both supported. If you are replacing a hood that used a different vent exit, you will need to block the existing opening and cut a new one. That adjustment, and any duct rerouting it requires, is the step most likely to convert an otherwise manageable DIY installation into one that benefits from professional help. When duct positions align, installation typically completes in one to two hours.
What We Like About the COS-5MU30
What We Found Lacking
Our COS-5MU30 Editorial Ratings
Our evaluation places the COS-5MU30 within its intended use case: light-duty ventilation above a 30-inch electric or induction cooktop in a small kitchen or apartment.
Dimension | Rating |
CFM Performance | 4/5 |
Noise Level | 4/5 |
Build Quality | 3/5 |
Filter and Maintenance | 4/5 |
Installation | 3/5 |
Value for Money | 3/5 |
What COS-5MU30 Owners Say After Installation
Those who install the COS-5MU30 in matched duct configurations consistently report completion within one to two hours. The push-button controls receive consistent praise across verified reviews for ease of use and clarity of labeling.
A pattern that appears across multiple verified sources is that the LED lighting concentrates toward the rear of the cooktop, leaving front burners with noticeably less coverage. This is an inherent consequence of the rear-mounted LED position within the slim body, not a defect in individual units.
A common concern reported across multiple sources is performance during high-heat cooking. Those who use the hood for intense frying or searing consistently note that smoke and steam escape capture at the edges. This is consistent with the CFM output analysis in the performance section and reflects the hood’s fixed 200 CFM ceiling.
COS-5MU30 vs. COS-5MU36: Series Comparison
Based on our evaluation, the choice between these two models depends entirely on cooktop width.
COS-5MU30 | COS-5MU36 |
30 inches | 36 inches |
Suitable for 30-inch electric or induction cooktops | Suitable for 36-inch electric or induction cooktops |
FAQs
Is the Cosmo COS-5MU30 a good range hood for a gas stove?
The COS-5MU30 is rated at 200 CFM, which falls below ASHRAE’s 250 CFM minimum for a 30-inch cooktop, and real-world duct delivery reduces that figure further. A standard four-burner gas range with combined output of 40,000 to 60,000 BTU requires significantly more extraction. This hood is not a practical fit for gas cooking beyond light use on low burners.
What is the CFM of the Cos 5mu30, and what does that mean in practice?
The manufacturer rates the COS-5MU30 at 200 CFM peak output under ideal conditions. In a standard residential duct run with two elbows and 8 feet of straight duct, effective delivery drops to approximately 140 to 150 CFM. This is adequate for electric cooktops under moderate load but insufficient for gas ranges or high-heat cooking sessions.
How often do you need to replace the filter on the Cos 5mu30?
The aluminum mesh grease filters are reusable and require no replacement under ducted use. Washing them monthly in the dishwasher is sufficient for moderate cooking frequency. In ductless mode, the CFK4 carbon filter requires replacement every six months under normal use; heavy cooking shortens that interval.
What is the difference between the COS-5MU30 and the COS-5MU36?
What is the difference between the Cosmo COS-5MU30 and the Cosmo COS-5MU36? The COS-5MU36 is 35.25 inches wide versus the COS-5MU30’s 29.75 inches, and it includes three mesh filters instead of two. Both share the same 200 CFM motor, noise levels, 5-inch duct, and construction grade. Choose based on cooktop width; there is no performance difference between the two.
Can the cos 5mu30 range hood be used without ductwork?
Yes. The COS-5MU30 supports ductless recirculating operation with the CFK4 carbon filter kit, sold separately. In ductless mode, air passes through the mesh filters and charcoal filter before returning to the kitchen. This mode filters grease and odors but does not exhaust moisture or heat. The charcoal filter requires replacement every six months.
Our Verdict
After a full evaluation, our position is clear: the Cosmo cos-5mu30 is the right choice for a 30-inch electric or induction cooktop in a small kitchen where the duct configuration is already in place and extraction demand stays within low-to-medium heat cooking.
It is not the right choice for gas cooking, high-heat use, or any kitchen where a higher CFM output is required. The CFM ceiling is fixed at 200 rated, and no installation adjustment changes that.
If your kitchen has an electric or induction cooktop, 5-inch duct access, and a cooking routine that stays within low-to-medium heat, the COS-5MU30 delivers reliable ventilation with quiet low-speed operation and a maintenance routine that costs nothing under ducted use. If that describes your kitchen, this is a decision you can make with confidence.
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