(WSBT) A U.S. House panel heard testimony Thursday about health problems some say stem from FEMA trailers. Many were made in Elkhart and Kosciusko counties.

Those who testified at the hearing blame their health problems on formaldehyde fumes. Those fumes come from the glue used to hold up the trailer's cabinets and paneling, and they can cause eye, nose, throat and skin irritations and breathing problems in large doses.

Some in Congress grilled FEMA, demanding to know if the 86,000 families still living in the trailers are at risk.

Lindsay Huckabee told the House investigative panel it has caused problems in her children.

"She began having asthma attacks. Three of my children began having nose bleeds several times a week," Huckabee said.

And doctors at the hearing testified the Huckabees aren't alone.

"Many children returned to my office with symptoms that would not go away, or would clear up, then promptly return," said Mississippi pediatrician Dr. Scott Needle.

The common denominator? All lived or still live in FEMA trailers, filled with formaldehyde coated paneling and particle board.

More than 50,000 of them were built by Nappanee-based Gulf Stream, others by Elkhart-based Forest River.

WSBT's phone calls to both companies were not returned Thursday, but a former floor supervisor at Gulf Stream's Etna Green plant told CBS News FEMA's massive order forced the company to use cheaper wood products.

Local RV dealers say the smell of formaldehyde is normal in the trailers. They say opening the doors and windows or turning on the air conditioner for just a few minutes can the fumes go away forever.

"At the time after the hurricanes, it was 90-100 degrees out," Elkhart-based Hart RV Sales Manager Steve Houser told WSBT. "That's when it's going to be the worst! If you weren't used to it, it would bother you for a short time," he said.

But dealers say the trailers aren't intended for long-term living. Even so, the say their customers haven't reported any health problems.

"I haven't heard one word since the FEMAs came out. Nobody's complained one bit," said Elkhart-based Trailer Town salesman Rich Fairchild.

In court documents filed this week, Forest River lawyer Jason Bone wrote that the company's trailers "meet all FEMA guidelines, and comply with federal and state law."

Thursday, Indiana Congressman Mark Souder agreed, telling the House panel that the industry is being "hung on one case" and that "177 formaldehyde complaints out of 100,000" don't substitute for "actual checking and measurement."

At the conclusion of Thursday's hearing, the panel agreed, saying more evidence needs to be found. They've asked the Centers for Disease Control to take a closer look at the trailers and determine exactly how toxic the levels are.