Merkhav Mugan (Hebrew: מרחב מוגן) (lit. protected space), also known as a "miklat" and popularly known as a mamad, is a reinforced security room required in all new buildings by Israeli law. A Merkhav Mugan is deemed preferable to a bomb shelter when the warning time is too short for residents to reach a shelter, which may be located some distance away. It also offers protection against high impact projectiles and chemical weapons.
Security rooms are based on a 1951 civil defense law that has undergone several revisions. After Israel was attacked by Scud missiles in the Gulf War, the Israeli Home Front Command established new guidelines for civil defense. In 1992, technical specifications were drawn up for designated protected spaces in family homes. The Merkhav Mugan can withstand blast and shrapnel from conventional weapons, and offers protection against chemical and biological weapons. It has reinforced concrete walls and ceilings, 20–30 cm thick floors, and airtight steel doors and windows.
- Merkhav Mugan Dirati (מרחב מוגן דירתי or ממ"ד) - installed in residential apartments.
- Merkhav Mugan Komati (מרחב מוגן קומתי or ממ"ק) - common floor space in apartment buildings in which there is no Merkhav Mugan Dirati in every apartment and in other multi-story buildings (mostly offices and industry).
- Merkhav Mugan Mosadi (מרחב מוגן מוסדי or ממ"מ) - installed in every public structure.