The Industrial HEPA Air Cleaner built by Madrigal Electromotive GmbH was used to filter the chemicals from the air coming from the meth lab in Breaking Bad.
It was obviously not a common item for a laundry, this can be surmised from the following facts:
- Gus went to considerable efforts in hiding its acquisition. E.G. Getting Gale to order it and having it 'disappear' from Madrigal's possession to his own. If it was a common item for that type of business, there would really be no point in concealing the acquisition or possession of it.
- It cost $300,000 commercially. It would have been more expensive, if anything, to obtain surreptitiously (so add at least ..50%?).
- Hank realized the significance of it, and associated it with a possible meth lab.
So if seeing it 'sitting around' at a laundry might cause suspicion (e.g. by Steve Gomez and the guy with the sniffer dog when they visited the premises), why not install it directly inside the meth lab where all the secret equipment was kept?
I'm thinking that hung from brackets on the roof, it could have taken the ducting in from the vats, then discharged out of the lab (now with clean air) into the usual venting/filtration system of the laundry.
BTW - judging from the size of the ducts seen in the brochure (and presuming that was the same basic size of duct that people were often connecting to the top of chemical tanks) it must have been 2 meters long, by 1 meter deep by a meter tall (OK - for those that think of lengths in the imperial system, approx. 6 feet x 3 feet x 3 feet). It was a sizable unit. The lab certainly had room for it (v. high ceiling) and it would have been tricky to conceal outside the lab.