When door effects are given for each zone, do they mean the main door or room doors?
They refer to the main door of the house, not ordinary internal doors.
Related questions
Are three doors in a straight row inauspicious?
They can be either. In the South and West, from where negative energy comes, three doors in a row on padas where doors should not be are inauspicious. In the North and East they are auspicious: temples, all built facing North or East, have three or five doors in a row, as do royal palaces, so the blanket belief that they are bad is a myth.
How do we find N1 to N8 and the other door padas on a map?
Use the zoning chakra shown on the first day, or draw it: from the centre of the map draw the four directions 90 degrees apart and the corner directions at 45 degrees, then halve again to 22.5 degrees and once more to 11.25 degrees, which gives 32 padas (360 degrees shared by the 32 guardian devtas). Starting from E1 next to the North-East line, go round clockwise from E1 to E8, then S1 to S8, W1 to W8 and N1 to N8, on the 81-pada grid. Practise this as homework.
A relative's flat had its door at E1. After buying the adjoining flat and removing the common wall the entrance came onto N4, and soon their ancestral land was acquired for a bullet-train project and they received crores. Is this the N4 effect?
Yes, this is chhappar phaad wealth, which comes as soon as N4 opens. E3, N4 and W4 are the three vipul sampada dwar (abundant-wealth doors). Opening them virtually gives perhaps 1 percent of the actual result, so do not believe the heavy promotion of virtual doors; it is the actual opening that brings the result.
A shop shutter often spans four padas, such as S3, S4, S5 and S6. Which pada decides the results?
Do not worry that S3 and S6 are also open: if the good pada, S4, is open within the shutter, the shop gives the results of S4, because when energy enters from every part, positive and negative, the result follows the positive. Trouble comes only when the good part is closed and the bad parts are open; then keep the shutter closed and open a small door on the good pada instead. In combination doors for business, always keep the favourable pada fully open.
Can doors be opened anywhere by vastu, or must the birth chart be checked?
Check the birth chart. If the Sun in the chart is debilitated and you forcibly open an E3 or E4 door, it will be wrong and not appropriate at all.
Can the main door be in the North-North-East?
No, the main door cannot be in the NNE.