Requirements for Corrosive Gases

The room should be free from dusts and corrosive gases, such as SO₂, H₂S, and NH₃. Table 1 lists the requirements for the corrosive gas concentration.

**Table 1** Requirements for corrosive gas concentration
Chemical active material	Unit	Concentration
SO₂	mg/m³	≤0.30
H₂S	mg/m³	≤0.10
NO_x	mg/m³	≤0.50
NH₃	mg/m³	≤1.00
Cl₂	mg/m³	≤0.10
HCl	mg/m³	≤0.10
HF	mg/m³	≤0.01
O₃	mg/m³	≤0.05

Take the following measures to meet the requirements:

Avoid constructing the room near a place where the corrosive gas concentration is high, such as a chemical plant.
Ensure the air intake vent of the room is in the prevailing upwind direction from any pollution source.
Place batteries in different rooms.
A professional service should monitor the corrosive gas conditions regularly.