Getting Available Memory On Remote Servers

I am often asked to give total and available memory across our enterprise to our Disaster Recovery guys. Here is a simple script that achieves that goal:

$Servers = Get-Content 'c:\ProductionScripts\Servers.txt'
Write-Host "Server,Total,Free"
foreach ( $server in $Servers )
{
$drives = Get-WmiObject `
-Class Win32_LogicalDisk `
-ComputerName $server `
-Filter "DriveType=3" `
-ErrorAction SilentlyContinue
$size = 0
$available = 0
foreach($drive in $drives)
{
[double]$size += $drive.size
[double]$available += $drive.freespace
}

$str = "{0},{1},{2}" -f $server,[MATH]::Round($size/1MB),[MATH]::Round($available/1MB)
Write-Host $str
}