what is the min/max cfm rating?

You would need to convert GPH to CFM. I have 3 8inch air stones running off my 1750gph in a 6ft deep pond.

Does this have any listed warranty? After using it for only a couple months it has stopped working.

These pumps are very inexpensive, so they don't come with a warranty that I know of. At roughly $30.00 per pump a couple of months is pretty inexpensive. Most will work longer. Still, the pump only cost you $15.00 a month. That's only $.50 per day. That's not bad. SB

Would the 18 watt pump be too much for a 150 gallon aquarium?

it will be just fine ! the pump comes with a manifold so you can adjust how much air you want from each separate outlet , i'm using it on a 125 g . (they are not quiet )

What diameter is the air inlet opening?

The air opening on the pump is tapered, so it will accommodate most, if not all plastic tubing.

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AquaMiracleAquarium Air Pump Commercial Air Pump with Aluminum Housing, 120W/1750GPH Fish Tank Bubbler Pond Aerator for Aquariums, Ponds, Hydroponics

AquaMiracleAquarium Air Pump Commercial Air Pump with Aluminum Housing, 120W/1750GPH Fish Tank Bubbler Pond Aerator for Aquariums, Ponds, Hydroponics

Product ID: 389630043

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Details

Colour
Silver
Brand
AquaMiracle
Material
Aluminium
Item weight
3.22 kg
Product dimensions
22.8L x 11.8W

⚡120W high-power motor

💨1750GPH airflow capacity

🛠️Durable aluminum housing

Description

💧 Pump up your aquatic game with power and precision!

COOL QUIET OPERATION - Aluminum alloy housing with enlarged surface area guarantees superior heat dissipation and long-lasting reliability.
UNMATCHED OXYGEN BOOST - 1750GPH airflow ensures your aquatic life thrives with premium oxygenation.
POWER PACKED PERFORMANCE - 120W electromagnetic motor delivers consistent, high-pressure air output at 0.032Mpa.
VERSATILE AQUATIC SOLUTION - Perfect for aquariums, ponds, hydroponics, fish farms, and seafood restaurants—elevate your ecosystem effortlessly.
CUSTOMIZABLE AIRFLOW CONTROL - 12-outlet chrome-coated manifold with adjustable knobs lets you tailor oxygen distribution exactly where you need it.

The AquaMiracle Commercial Air Pump features a robust 120W electromagnetic motor delivering 1750GPH airflow at 0.032Mpa pressure. Its durable aluminum housing ensures excellent heat dissipation for reliable, long-term use. Equipped with a 12-outlet adjustable chrome manifold, it offers versatile oxygenation solutions for aquariums, ponds, hydroponics, and more.

Specifications

Color	Silver
Size	120W, 1750GPH
Style	120W-1750GPH
Material type	Aluminium
Power source	Corded Electric
Wattage	120 watts
Included components	Air Pump, Air Manifold
Batteries included?	No
Brand	AquaMiracle
Manufacturer	AquaMiracle
Item model number	ACO006
Product Dimensions	27.51 x 17.55 x 12.95 cm; 3.22 kg
ASIN	B08H28HXFR