It looks like this has a 3" duct connector. Are there any issues connecting it to a 4" duct, other than needing a 3" to 4" transition connecor?

There shouldn't be any issues as long as you have the right duct connection. The fan works well and is still quiet after 2 years of use.

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💨 Breathe smarter, live fresher — the fan that knows your air

ENERGY STAR CERTIFIED - Save energy with 5.8 CFM/watt efficiency and brushless DC motor tech
SMART HUMIDITY SENSOR - Automatically activates above 60% humidity for perfect air quality
COMPACT SLEEK DESIGN - Only 7.5" x 7.25" footprint fits any ceiling or wall space effortlessly
ULTRA QUIET PERFORMANCE - Operates at just 1 sones—barely noticeable, always effective
EASY RETROFIT INSTALLATION - Compact housing designed for seamless replacement of older bath fans

The Delta BreezSlim SLM70H is a UL-listed, Energy Star qualified exhaust bath fan featuring a brushless DC motor and a fixed humidity sensor that automatically activates above 60% humidity. Its compact 7.5" x 7.25" size allows easy ceiling or wall installation, delivering 70 CFM airflow at whisper-quiet 1 sones noise level. With an energy efficiency of 5.8 CFM/watt and LED indicators for sensor and full speed modes, it’s the perfect upgrade for modern, eco-conscious homes.

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Bs.3706

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

Ravi S.

I loved the variety of products available. Will definitely shop again.

2 months ago

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Manufacturer	Delta Electronics (Americas) Ltd
Part Number	SLM70H
Product Dimensions	18.29 x 19.05 x 9.91 cm; 1.81 kg
Item model number	SLM70H
Size	70 CFM
Colour	With Humidity Sensor
Style	With Humidity Sensor
Power Source	Corded Electric
Voltage	120 Volts
Wattage	13.1 watts
Item Package Quantity	1
Sound level	1 Sones
Certification	ul listed
Special Features	Portable, Oscillating
Batteries included?	No
Batteries Required?	No
Item Weight	1.81 kg

Delta BreezSlim SLM70H Exhaust Bath Fan with Fixed Humidity Sensor

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