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These tests? >> the fema guidelines require wind pressures for the storm come from a 250-mile-per-hour ground speed tornado and that's speed on the ground and that the typical debris generated by that storm would be a wooden 2x4 that's 15 pounds and propelled at 100 miles an hour. >> so you recreate those conditions in a lab using these commercially available buildings. do you feel like people who are marketing these -- obviously this is a public safety issue, also a business. when you are finding people marketing these, are their products good products when people market these things as safe,...

For being with us tonight. >> you're very welcome, rachel. >> you are an expert on these things and you work in this field and i do not. let me first ask you if in terms of explaining safe rooms and how they have functioned in the past and how towns rely on them, is that basically your understanding? >> safe rooms certainly will if they're tested, safe rooms will certainly protect you from these kinds of storms no doubt. >> what kind of wind speeds can structures withstand? how do you test them and what kind of failures are you looking for when you put them through these tests? >> the fema gui...

Mr. tanner, thank you very much for being with us tonight. >> you're very welcome, rachel. >> you are an expert on these things and you work in this field and i do not. let me first ask you if in terms of explaining safe rooms and how they have functioned in the past and how towns rely on them, is that basically your understanding? >> safe rooms certainly will if they're tested, safe rooms will certainly protect you from these kinds of storms no doubt. >> what kind of wind speeds can structures withstand? how do you test them and what kind of failures are you looking for when you put them thro...