... combination of contact and air- sampling information is required to assess most buildings (Figure 6. 1), and these acceptable numbers vary given different biological contaminant mixes and building usage ... surfaces and in waters 6. 3.13 What Can Be Done to Prevent Aspergillus Growth? Keep the air dry, provide filtered replacement air, and have sufficient air exchanges Prevent accumulation of standing ... originating from solvent-based building materials and cleaning supplies, including hexane, methylene chloride, benzene, and acetone 6. 6 .6 Controlling Fungi Moisture, heat, and dirt or dusts are...