Would this work with my DC?

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Forum topic by LucasWoods posted 08-17-2018 08:52 PM 346 views 0 times favorited 2 replies Add to Favorites Watch
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448 posts in 2144 days

08-17-2018 08:52 PM

I got an older 2HP Grizzly dust collector from my grandpa (at least 15 years old, maybe more) it does not have a model number on it.

The problem is it has a 4 3/4 inlet cover and just a single dust collection port.

I am looking to get a new inlet cover that is 6” along with a new Y-Inlet that will give me two 4” lines and will connect to the 6” inlet cover.

The question I have since this is a new inlet cover will it fit my current model since it is older? The manual for their “newer” 2HP model doesn’t have dimensions. I also doubt the size or any part of the design has changed much over the years.

I also don’t think I will need a bigger impeller as yes I will be moving from a 4 3/4 inlet to a 6” but the lines going to the 6” will just be 4” lines.

-- Colorado Springs, CO - USAF

2 replies so far

View RobHannon's profile


337 posts in 1341 days

#1 posted 08-17-2018 09:00 PM

I have an older 2hp Grizzly as well that I changed from a 5” to 6” inlet. I did not buy a replacement from Grizzly. Instead, I replaced mine with a homemade inlet using a 6” HVAC takeoff and a MDF circle made to match the old one. I’m sure the same could be done with steel, I just had a scrap MDF circle big enough from the separator I was building at the time.

I have been fine with the stock impeller and 6” ductwork. It is a larger impeller than the 2hp Harbor Freight DC that otherwise looks very similar.

View Lazyman's profile


5682 posts in 2198 days

#2 posted 08-17-2018 09:21 PM

Did you just look for a Y fitting that will fit your current inlet? 4 3/4 seems like an odd size though so it might need some sort of adapter?

Are you going to use blast gates to shut one off while not in use? Perhaps you could just make a 2 port blast gate that allows you to choose between the 2 lines? I’ve seen a couple of different 2 port blast gates done by YouTubers.

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

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