Principle no. 1

• Pure and wholesome water

• Water in sufficient volume and pressure

• Minimum quantity of water

• Prevent dangers from explosion

Principle no. 2

• Water in sufficient volume and pressure

• Minimum quantity of water

• Prevent dangers from explosion

• Connected to public sewer

Principle no. 3

• Minimum quantity of water

• Prevent dangers from explosion

• Connected to public sewer

• At least 1 WC and 1 kitchen sink

Principle no. 4

• Prevent dangers from explosion

• Connected to Public Sewer

• At least 1 WC and 1 kitchen sink

• Fixtures smooth non-absorbent material

Principle no. 5

• Connected to public sewer

• At least 1 WC and 1 kitchen sink

• Fixtures smooth non-absorbent material

• Drainage with cleanouts

Principle no. 6

• At least 1 WC and 1 kitchen sink

• Fixtures smooth non-absorbent material

• Drainage with cleanouts

• Durable NAMPAP-approved materials

Principle no. 7

• Fixtures smooth non-absorbent material

• Drainage with cleanouts

• Durable NAMPAP-approved materials

• Water-sealed trap

Principle no. 8

• Drainage with cleanouts

• Durable NAMPAP-approved materials

• Water-sealed trap

• Adequate circulation of air

Principle no. 9

• Durable NAMPAP-approved materials

• Water-sealed trap

• Adequate circulation of air

• Vent terminals extend to outer air

Principle no. 10

• Water-sealed trap

• Adequate circulation of air

• Vent terminals extend to outer air

• Tests to disclose leaks and defects