As gaps and draft spots get sealed off, 'air' moves around in the building to find another way out. As I sealed, one closet on the front, side closet in the middle of the apt (not inside, just front door, temp taping) and did some sealing in the kitchen side - but I think that's irrelevant - I guess there are two major air flows hitting this unit from bottom and inside wall space - so as cracks and gaps get dealt with, air pressure increases in the remaining, still open cracks and gaps. Backroom - bedroom's last - most back large window's upper crack never had much of the air coming up, but now it's streaming like - wow - so all the dusts and garbages behind the wall space is also blowing up into the room, other things are, 1. might be basement's water heater oil burner's exhaust is leaking into wall spaces - and that might be causing this much of black coatings on the floor - I'm not sure, but I still can't explain why all floors get coated in diesel like black tar - thinly - every 2 days. one more thing is in winter people shuts windows, it's been cold, that would affect - usually intensity how much crap and stuff happens in and via wall spaces. this photo really doesn't capture much of the dust, but I was in a hurry to get things as much as possible, so couldn't spend time to take decent ones.

The diesel powered version of the M88, called the M88A1, was produced in response to the dieselization of the US Army tactical vehicle fleet. Initial trials demonstrated an increase in operating range from 360 to 450 km. This vehicle also had a modified transmission, a diesel-fired personnel heater and auxiliary power unit, and stowage space for a small quantity of LAW anti-tank weapons. The hydraulic system was redesigned to allow the auxiliary power unit to operate the main winch cable as well as stow the boom and spade to prepare the vehicle for recovery, should the hydraulic system fail. The converted vehicle was designated the M88E1 and BMY built five prototypes for accelerated evaluation. The M88A1 was type classified in March 1975. Due to an increased need for medium recovery vehicles and a desire to improve those already in the field, the US Army contracted in 1975 to reopen the M88 production line at the BMY plant in York, Pennsylvania. Conversion of existing M88s to this new form ended in 1982 and new vehicle production initially ended in 1989, with a total of 3,042 M88A1 ARVs produced. But this was not the end of M88A1 production, as the assembly lines were once again started up in 1991 to meet the demand for a number of foreign customer sales.