S2: lack of children and fear of fire. S3: servitude (dasta), the person stays a loyal servant all his life and barely runs his own house. S4 (Grihakshat): the only fully good South door, giving happiness, peace, prosperity and profit; many South-facing businesses with an S4 door were found very prosperous. S5: trouble up to death-like suffering. S6: the door of selfish people with no gratitude. S7: karz dwar, poverty, loans turning into NPAs, drowning in debt.
S8 (South-West corner): constant trouble, father-son discord, heavy expenses and death-like illness, since residents there are most affected by Rahu. In one case the South-West was lowered, an S8-W1 combination door sat at the lowest level, the South-West was open and an underground water tank pit was dug beside it; the owner got cancer and died within a year of moving in.
A South door (S4) suits people of Cancer, Capricorn or Virgo rashi (some include Taurus), mulank 9 (born on the 9th, 18th or 27th), or with Mars exalted (Capricorn) or in its own sign (Aries, Scorpio). If such people open S5 or S6 instead, severe problems follow.