Lexus LFA Owner's Manual page 286

4-3. Do-it-yourself maintenance
Checking interval
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Inspect and replace the air conditioning filter according to the maintenance sched-
ule. In dusty areas or areas with heavy traffic flow, early replacement may be
required. (For scheduled maintenance information, please refer to the "Owner's
Manual Supplement" or "Scheduled Maintenance".)
If air flow from the vents decreases dramatically
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The filter may be clogged. Check the filter and replace if necessary.
NOTICE
When using the air conditioning system
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Make sure that a filter is always installed.
Using the air conditioning system without a filter may cause damage to the system.
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