Из мануала 2002го года FM 3-06.11 COMBINED ARMS OPERATIONS
IN URBAN TERRAIN:

b. Backblast. Backblast effects must be considered when employing recoilless
weapons. During combat in urban areas, the backblast area in the open is more hazardous
due to loose rubble and the channeling effect of the narrow streets and alleys.
(1) When firing recoilless weapons in the open, soldiers should protect themselves
from blast and burn injuries caused by the backblast. All personnel should be out of the
danger zone. Anyone not able to vacate the caution zone should be behind cover. Soldiers
in the caution zone should wear helmets, protective vests, and eye protection. The shooter
and all soldiers in the area should wear earplugs.
(2) Since the end of World War II, the US Army has conducted extensive testing on
the effects of firing recoilless weapons from within enclosures. Beginning as early as
1948, tests have been conducted on every type of recoilless weapon available. In 1975,
the US Army Human Engineering Laboratory at Aberdeen Proving Grounds, Maryland,
conducted extensive firing of the LAW, Dragon, and TOW from masonry and frame
buildings, and from sandbag bunkers. These tests showed the following:
(a) Firing these weapons from enclosures presented no serious hazards, even when
the overpressure was enough to produce structural damage to the building.
(b) Little hazard exists to the gunnery or crew from any type of flying debris. Loose
items were not hurled around the room.
(c) No substantial degradation occurs to the operator’s tracking performance as a
result of obscuration or blast overpressure.
(d) The most serious hazard that can be expected is hearing loss. This must be
evaluated against the advantage gained in combat from firing from cover. To place this
hazard in perspective, a gunner wearing earplugs and firing the loudest combination (the
Dragon from within a masonry building) is exposed to less noise hazard than if he fired a
LAW in the open without earplugs.
(e) The safest place for other soldiers in the room with the shooter is against the wall
from which the weapon is fired.
(f) Firers should take advantage of all available sources of ventilation by opening
doors and windows. Ventilation does not reduce the noise hazard, but it helps clear the
room of smoke and dust, and reduces the effective duration of the overpressure.
(g) The only difference between firing these weapons from enclosures and firing
them in the open is the duration of the pressure fluctuation.
(h) Frame buildings, especially small ones, can suffer structural damage to the rear
walls, windows, and doors. Large rooms suffer slight damage, if any.
Из TRADOC bulletin 3 Soviet antitank grenade launcher RPG-7:
The RPG-7 can be employed in all types of constructed fortifications to include positions with overhead cover and inside buildings. The gunner needs only two meter safety distance from the rear bunker wall. Tests also indicate that RPG-7 can be fired safely from inside buildings.
Из TRADOC bulletin 5 Training with LAW:
One of the myths about LAW use was that it could not be fired from inside buildings. LAW does produce a dangerous backblast when fired and gunners must account for that, particularly in peacetime training. But, IN COMBAT, LAW can be fired safely from inside buildings and bunkers with overhead cover if a few safety precautions are observed. The safety precautions noted below were confirmed recently by the Human Engineering Laboratories at Aberdeen Proving Grounds.
- Room requires about 20 sq feet of ventilation - that equals 1 door and 1 window; both open.
- 4' Minimum from rear wall.
- Non-firers have to stay in front of the backblast area.
- Everyone in room must wear earplugs and helmets.
Такие вот дела. Про АТ-4, Джавелины и прочее тоже где-то видел, но сейчас лень искать.
На вики о Панзерфаусте 30 утверждают, что " it had a 3.3 cm (1.3 in) diameter tube containing 54 grams (1.9 oz) of black powder propellant". Это вот это чудо жгло немцев если стрельба не из концертного зала на улицу велась?