What is logic behind size of insulation mattress which is
50 x 1220 x 1640 mm LRB or
50 x 3810 x 610 mm ceramic wool
We already know that IS 8183:1993 does not insist for specific size.
further 1220 x 1640 mm = 2 sq meter area
1220 mm = 4 ft ( interesting ? )
but still it seems that there a logic behind that