6 Inch to 4 Inch HVAC Duct Reducer & Increaser - Galvanized Sheet Metal Ducting Connector for Airflow, Heating, Cooling, & Air Ventilation System Extra Strength and Fittings

The fittings were great and used to raise a smoke stack on a grill

Reducer worked great quality sheet metal part.NOTE: This is not crimped on either side you will need to crimp it to fit inside of the mating pipe if needed.

We needed a 4" to 6" connection when we were installing an external fan to a laser cutting machine we are using in the house and venting to outside. Both the 4" and 6" ducting was very difficult to work onto the ends, but callouses and perseverance go us through and eventually we were able to work it down well enough. We secured it with metal bands and sealed with aluminum tape. That ducting is never coming off. It would have been helpful if the connections were just a hair smaller. But other than that, it is a well made, quality product.

A lot shorter than the ones I can get at the local hardware store, which for me is a good thing. Not much to go wrong with this.

Will not work with plastic dust fittings.

If you need a 6-to-4 reducer, I'm not sure you could do any better. This is extremely well made and does the job. Very impressed.

I needed a compact reducer to fit a tight space. This one is about 5.5” which is much shorter than the ones at the orange box store although it is almost twice the price. One reviewer claimed it had fully welded seams and closely spaced tiny precision spot welds. This was not the case. I received a very poorly riveted version with substantial holes to allow air to escape. Also both ends were female contrary to one community answer which indicated the 4 inch end was male. The orange box store version has 6” female and 4” male. I think the discrepancies are because Amazon mixes reviews and answers for dissimilar products. TAACS was the seller of the one I purchased. I ended up finding an identical sized version at osh but it was much better quality. It was also female on both ends. The blue box store has a slightly larger version also with dual female ends.

poor finishes. Interior not smooth.