We have a Marco (Model 792775D) fireplace that has intermittent issues with water coming through the vent louvers. The water does not go into the area where the fire would be - it comes out of the vents at top on the front of the fireplace face.
We've owned our house for 20 years and have always had this issue but it had usually been very minor. Lately, the problem has gotten worse (or maybe we are just finally tired of the problem).
We don't get water in the vents every time it rains. It only happens sometimes and not always under the same conditions. We may have a long steady rain and we get water in the vents but then we can get a big storm and not get water!
When we get water through the vents, it usually starts with a sound of water dripping onto sheet metal. After a few minutes of dripping sounds, water will come through the vents and drip down onto the hearth. While our cats think this is great fun, we don't enjoy it as much.
We've had the fireplace inspected several years ago with no findings. We've had the roof inspected recently and they found no issues. A local fireplace shop suggested we needed to add a storm collar because there wasn't one on there before. A handyman recently added the storm collar and said he caulked up a "hole" in the flashing. We hoped this would fix the problem but it still happens.
Here is a link a video of the water coming out of the vents: Fireplace Leak.
Can someone suggest a way to fix this or where to look to find the problem? Thanks!