Panasonic KX-TDA30, Installation Manual

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Object Material Transmission Tendency
Window Glass Radio waves usually penetrate them.
Glass with wire net Radio waves can penetrate them, but tend to be reflected.
Glass covered with
heat-resistant film Radio waves are weakened considerably when they penetrate
windows.
Floor Ferroconcrete Radio waves can penetrate them, but the more iron there is, the more
radio waves are reflected.
Partition Steel Radio waves are reflected and rarely penetrate them.
Plywood, Glass Radio waves usually penetrate them.
Column Ferroconcrete Radio waves can penetrate them, but the more iron there is, the more
radio waves tend to be reflected or diffracted.
Metal Radio waves tend to be reflected or diffracted.
Cabinet Steel Radio waves are usually reflected or diffracted, and rarely penetrate
them.
Wood Radio waves can penetrate them, but they are weakened.
Installation Manual 127
2.7.3 Site Planning