Lasko Air Flex 20" 2-in-1 Box Fan and Air Purifier with MERV10 Air Purifier Filter for Cleaner and Cooling Breathe 3 Speed Steel Body FF305

Lasko Air Flex 20" 2-in-1 Box Fan and Air Purifier with MERV10 Air Purifier Filter for Cleaner and Cooling Breathe 3 Speed Steel Body FF305

Q: What size filters fit the FF305 fan?

The ACTUAL size of the filter that comes with the unit is 19.5 x 19.5 x .75. So when you try to stuff an actual 20x20x1 into the housing, it doesn't fit-up properly at the bottom, and distorts the plastic housing slightly which exacerbates the problem. I put in a 3M Filtrete 20x20x1 MERV 11 and it crushes the filter cardstock frame. This is irritating considering the cost of premium filters. The product information should really be specific about this detail.

Q: Will the motor overheat while using a merv-13 20x20x1? i've experienced overheating in other lasko fans in diy air filter setups using a 1inch filter.

The FF305 was specifically designed to ensure there would not be any motor burn out regardless of what 20x20x1 filter was placed in the unit. That is based on the motor and the filter housing. Please note though, there would be a reduction in air flow if you went from a MERV 10 to a MERV 13 filter just as you would see an increase in air flow if you went from a MERV 13 to a MERV 10. Just remember to regularly change whatever filter you choose to use.

Q: Does the filter go on the "back" or "front" ("intake" or "output") side of the fan?

The filter goes in the compartment on the back of the fan, the intake side. I love these fans. They are invaluable during allergy and wildfire season.

4.2/5

Product ID: 744521226

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Details

Color
Silver
Brand
LASKO
Product Dimensions
16.2D x 54.1W
Specification Met
ETL Certified
Particle Retention Size
72 Inches

⚙️3 energy-efficient speeds

🌬️2000 CFM airflow

🛡️MERV 10 air purifier filter

Frequently Bought Together

Lasko Air Flex 20" 2-in-1 Box Fan and Air Purifier in One with MERV10 Air Purifying Filter for Cleaner and Cooling Breeze, 3 Speeds, Steel Body, FF305

Aerostar 20x20x1 MERV 8 - 6 Count - High Efficiency Pleated HVAC, Furnace & Air Conditioner Filters - Removes Dust, Lint, Mold & Allergy-Causing Pollen

Simply 20x20x1 Air Filter, Merv 8, MPR 600, 6 Pack, Furnace Air Filter for HVAC (Actual Size: 19.75"x19.75"x0.75") DUST, Pet, & Allergy Control

Description

🌪️ Elevate your air game — cool, clean, and unstoppable!

BUILT TO LAST - Durable steel body with UV protection paint and Weather-Shield motor ensures long-lasting performance, even by your window.
TURBOCHARGED BREEZE - 5-blade design delivers a powerful 2000 CFM airflow to keep you cool and comfortable all day.
CLEAN AIR CONFIDENCE - MERV 10 pleated filter traps dust, pollen, and allergens for a healthier breathing environment.
CUSTOMIZABLE COMFORT - Three energy-efficient speed settings let you tailor airflow and purification to your exact needs.
DUAL ACTION AIR POWER - Experience refreshing cool air while purifying your space with the 2-in-1 fan and air purifier combo.

The Lasko Air Flex 20" 2-in-1 Box Fan and Air Purifier combines a powerful 5-blade fan delivering 2000 CFM airflow with a MERV 10 air purifier filter to provide both cooling and cleaner air. Featuring a durable steel body with UV protection and a Weather-Shield motor, it offers three energy-efficient speeds for customizable comfort in any room.

Specifications

Manufacturer	Lasko
Model Number	FF305
Package Dimensions	63 x 55.9 x 16.8 cm
Material	plastic
Color	Silver
Size	2XL
Wattage	100 W
Special Features	2-in-1 Box Fan and Air Purifier, Durable Construction, MERV 10 Filter, 3 Speeds
Voltage	120 Volts
Number of Blades	5
Package Weight	5.38 Kilograms
Batteries Required	No
Batteries Included	No
Brand Name	LASKO

Have a Question? See What Others Asked

What size filters fit the FF305 fan?

Will the motor overheat while using a merv-13 20x20x1? i've experienced overheating in other lasko fans in diy air filter setups using a 1inch filter.

Is t just 110 volts or 110-220v so international buyers can also benefit ?

Does the filter go on the "back" or "front" ("intake" or "output") side of the fan?

Reviews

4.2

All from verified purchases

T**L

軽いし強力です。

部屋が排気能力ばかりで吸気が足りないと思った為購入しました。ベランダへ出る窓の前で回す事でしっかり換気できるようになりました。二酸化炭素濃度としてはこの製品なしの時は 500 PPM 程度までしか下がらなかったのが、この製品を使うと簡単に 450 PPM 程度まで下がるようになったので数値的に効果を実感できています。音は無音とは程遠く、しっかりと聴こえるのですが、不快ではない低い音が安定して聴こえているので自分は気になりません。若干残念だった点は最初から何かにぶつけて外装の一部がはげている部分があり、そこに錆が生じていたことですが、さび落とし後にさび止めを塗って対処しました。ベランダへの窓の前に配置しているので使う時に毎回少し移動させていますが、軽いので全く苦になりません。とてもお勧めできる商品です。

27.07.2025

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TrustScore 4.5 | 7,300+ reviews

Reema J.

Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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