Table 2.

Value of the air tightness in the housing.

Category	Flow (kg/s·m2@1 Pa)		Coefficient flow exponent
	Outdoor	Indoor	Outdoor	Indoor
Windows	0.0030	0.003	0.60	0.60
Doors	0.0030	0.003	0.66	0.60
Grids	0.0400	0.020	0.66	0.60
Walls	0.0004	0.019	0.70	0.75
Floors	0.0020	0.003	1.00	0.70
Roofs	0.0002	—	0.70	—